Source

perl-XML-LibXML / example / libxml.xml

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<module name="XML::LibXML">
    <version>1.49</version>
    <authors>
        <author>Matt Sergeant</author>
        <author>Christian Glahn</author>
    </authors>
    <package name="XML::LibXML::DOM">
        <short>XML::LibXML DOM implementation</short>
        <description>
            <p>
                XML::LibXML implements a native DOM so the parsed
                structures are accessable from the perl layer. The
                current implementation offers an alternative interface
                to many DOM functions in addition to the specified
                functions. These functions will be removed in future
                versions or renamed to perl style names.
            </p>
            <p>
                XML::LibXML's DOM implementation tries to follow the
                various DOM specs although not all interfaces are
                implemented yet. Also there some efford is taken to
                also to follow the XPath DOM extensions. There are 
                many functions that are specified for DOM and already 
		present in XML::LibXML's DOM API, but still not 
                documented.
            </p>
            <p>
		Although XML::LibXML provides the more important interfaces 
                to node structures, there are not all node types implemented 
                (yet). The more common functions are provided by 
                XML::LibXML::Node, so it should be possible to access most 
		parts of the document. Since XML::LibXML wraps only the 
		document structure provided by libxml2, XML::LibXML::Node 
		will not work properly with nodes found in a DTD, since they
		are not nodes in context of libxml2. 
            </p>
            <p>
                Besides that XML::LibXML's DOM Api should provide
                a more perlish interface to the DOM structure libxml2 
                generates. 
            </p>

        </description>
    </package>
    <package name="XML::LibXML::Document">
        <short>DOM Document Class</short>
        <description>
            <p>
                The Document Class is the result of a parsing
                process. But sometimes it is necessary to create a
                Document from scratch. The DOM Document Class provides
                functions that are conform to the DOM Core naming
                style.
            </p>
            <p>
                It inherits all functions from
                <em>XML::LibXML::Node</em> as specified in DOM
                Level2. This enables to access the nodes beside the
                root element on document level - a <em>DTD</em> for
                example. The support for these nodes is limited at the
                moment, so I would recommend, not to use <em>node</em>
                functions on <em>documents</em>.
            </p>
            <p>
                It is suggested that one should always create a node
                not bound to any document.  There is no need of really
                including the node to the document, but once the node
                is bound to a document, it is quite safe that all
                strings have the correct encoding.  If an unbound
                textnode with an iso encoded string is created
                (e.g. with $CLASS->new()), the <em>toString</em>
                function may not return the expected result.
            </p>
            <p><st>NOTE:</st> XML::LibXML magic encoding may not work 
               on all plattforms. Some platforms are known to have a broken
               iconv(), which is partly used by libxml2.
            </p>
            <p>
                This seems like a limitation as long UTF8 encoding is
                assured. If iso encoded strings come into play it is
                much safer to use the node creation functions of
                <st>XML::LibXML::Document</st>.
            </p>

            <method name="new" 
                    synopsis="$dom = XML::LibXML::Document->new( $version, $encoding );">
                <p>
                    alias for createDocument()
                </p>
            </method>

            <method name="createDocument" 
                    synopsis="$dom = XML::LibXML::Document->createDocument( $version, $encoding );">
                <p>
                    The constructor for the document class. As
                    Parameter it takes the version string and
                    (optionally) the ecoding string.  Simply calling
                    <st>createDocument</st> will create the document:
                </p>

                <example><![CDATA[
 <?xml version="your version" encoding="your encoding"?>
                    ]]></example>

                <p>
                    Both parameter are optional. The default value for
                    <st>$version</st> is <em>1.0</em>, of course. If
                    the <st>$encoding</st> parameter is not set, the
                    encoding will be left unset, which means UTF8 is
                    implied (and set).
                </p>
                <p>
                    The call of <st>createDocument</st> without any
                    parameter will result the following code:
                </p>
                <example><![CDATA[
 <?xml version="1.0"?>
                    ]]></example>
            </method>

            <method name="getEncoding"
                    synopsis="$strEncoding = $doc->getEncoding();">
                <p>
                    returns the encoding string of the document
                </p>
            </method>

            <method name="getVersion"
                    synopsis="$strVersion = $doc->getVersion();">
                <p>
                    returns the version string of the document
                </p>
            </method>

            <method name="toString" 
                    synopsis="$docstring = $dom->toString([$format]);">
                <p>
                    <st>toString</st> is a deparsing function, so the
                    DOM Tree can be translated into a string, ready
                    for output.
                </p>
                <p>
                    The optional <st>$format</st> parameter sets the
                    indenting of the output. This parameter is
                    expected to be an <em>integer</em> value, that
                    specifies the number of linebreaks for each node.
                </p>
                <p>
                    For more information about the formatted output
                    check the documentation of
                    <em>xmlDocDumpFormatMemory</em> in
                    <em>libxml2/tree.h</em>.
                </p>
            </method>
            
            <method name="toStringHTML"
                    synopsis="$document->toStringHTML();">
                <p>
                    <st>toStringHTML</st> deparses the tree to a
                    string as HTML. With this method indenting is
                    automatic and managed by libxml2 internally.
                </p>
            </method>

            <method name="is_valid" 
                    synopsis="$bool = $dom->is_valid();">
                <p>
                    Returns either TRUE or FALSE depending on the DOM Tree is a
                    valid Document or not.
                </p>
                <p>
                    You may also pass in a XML::LibXML::Dtd object, to
                    validate against an external DTD:
                </p>
                <example>
 if (!$dom->is_valid($dtd)) {
     warn("document is not valid!");
 }
                </example>
            </method>

            <method name="validate"
                    synopsis="$dom->validate();">
                <p>
                    This is an exception throwing equivalent of
                    is_valid. If the document is not valid it will
                    throw an exception containing the error. This
                    allows you much better error reporting than simply
                    is_valid or not.
                </p>
                <p>
                    Again, you may pass in a DTD object
                </p>
            </method>

            <method name="getDocumentElement" 
                    synopsis="$root = $dom->getDocumentElement($name, $namespace );">
                <p>
                    Returns the root element of the Document. A
                    document can have just one root element to contain
                    the documents data.
                </p>
            </method>

            <method name="doumentElement" 
                    synopsis="$root = $dom->documentElement;">
                <p>
                    Alias for <st>getDocumentElement</st>.
                </p>
            </method>

            <method name="setDocumentElement" 
                    synopsis="$dom->setDocumentElement( $root );"> 
                <p>
                    This function enables you to set the root element for a
                    document. The function supports the import of a node from a
                    different document tree.
                </p>
            </method>

            <method name="createElement" 
                    synopsis="$element = $dom->createElement( $nodename );">
                <p>
                    This function creates a new Element Node bound to
                    the DOM with the name <em>$nodename</em>.
                </p>
            </method>

            <method name="createElementNS" 
                    synopsis="$element = $dom->createElementNS( $namespaceURI, $qname );">
                <p>
                    This function creates a new Element Node bound to
                    the DOM with the name <em>$nodename</em> and
                    placed in the given namespace.
                </p>
            </method>

            <method name="createTextNode" 
                    synopsis="$text = $dom->createTextNode( $content_text );">
                <p>
                    As an equivalent of <st>createElement</st>, but it
                    creates a <st>Text Node</st> bound to the DOM.
                </p>
            </method>

            <method name="createComment" 
                    synopsis="$comment = $dom->createComment( $comment_text );">
                <p>
                    As an equivalent of <st>createElement</st>, but it
                    creates a <st>Comment Node</st> bound to the DOM.
                </p>
            </method>

            <method name="createAttribute"
                    synopsis="$attrnode = $doc->createAttribute($name [,$value]);">
                <p>
                    Creates a new Attribute node. 
                </p>
            </method>

            <method name="createDocumentFragment"
                    synopsis="$fragment = $doc->createDocumentFragment()">
                <p>
                    This function creates a DocumentFragment. 
                </p>
            </method>

            <method name="createAttributeNS"
                    synopsis="$attrnode = $doc->createAttributeNS( namespaceURI, $name [,$value] );">
                <p>
                    Creates an Attribute bound to a namespace.
                </p>
            </method>

            <method name="createCDATASection"
                    synopsis="$cdata = $dom->create( $cdata_content );">
                <p>
                    Similar to createTextNode and createComment, this
                    function creates a CDataSection bound to the
                    current DOM.
                </p>
            </method>

            <method name="importNode"
                    synopsis="$document->importNode( $node [, $move] );">
                <p>
                    If a node is not part of a document, it can be
                    imported to another document. As specified in DOM
                    Level 2 Specification the Node will not be altered
                    or removed from its original document by
                    default. (<em>$node->cloneNode(1)</em> will get
                    called implicitly).
                </p>
                <p>
                    Sometimes it is nessecary to <em>move</em> a node
                    between documents. In such a case the node will
                    not be copied, but removed from the original
                    document.
                </p>
                <p>
		<st>NOTE:</st> Don't try to use importNode() to import 
		subtrees that contain an entity reference - even if 
		the entity reference is the root node of the subtree. 
		This will cause serious problems to your program. This is
		a limitation of libxml2 and not of XML::LibXML itself.
		</p>
            </method>

        </description>
        <also>
            <item name="XML::LibXML"/>
            <item name="XML::LibXML::Element"/>
            <item name="XML::LibXML::Text"/>
            <item name="XML::LibXML::Attr"/>
            <item name="XML::LibXML::Comment"/>
            <item name="XML::LibXML::DocumentFragment"/>
        </also>
    </package>

    <package name="XML::LibXML::Node">
        <short>"virtual" Base Class DOM-Nodes</short>
        <description>
            <p>
                LibXML::Node defines functions that are common to all
                Node Types.  A LibXML::Node should never be created
                standalone, but as an instance of a high level class
                such as LibXML::Element or LibXML::Text.  The class
                itself should provide only common functionality. In
                XML::LibXML each node is part either of a document or
                a document-fragment.  Because of this there is no node
                without a parent. This may causes confusion with
                "unbound" nodes.
            </p>

            <method name="getName" 
                    synopsis="$name = $node->getName();">
                <p>
                    Returns the node's name. This Function is aware
                    about namesaces and returns the full name of the
                    current node (<em>prefix:localname</em>)
                </p>
            </method>

            <method name="nodeName"
                    synopsis="$name = $node->nodeName;">
                <p>
                    Alias for <st>getName()</st>.
                </p>
            </method>

            <method name="setName"
                    synopsis="$node->setName( $newName );"> 
                <p>
                    In very limited situation it is usefull to change
                    a nodes name. In the DOM specification this should
                    throw an error. This Function is not aware about
                    namespaces yet.
                </p>
            </method>

            <method name="isSameNode"
                    synopsis="$bool = $node->isSameNode( $other_node );">
                <p>
                    returns TRUE (1) if the given nodes refer to the same
                    nodestructure, otherwise FALSE (0) is returned.
                </p>
            </method>
            <method name="isEqual"
                    synopsis="$bool = $node->isEqual( $other_node );">
                <p>
                   depraced version of isSameNode().
                </p>
		<p><st>NOTE</st> isEqual will change behaviour to 
		   follow the DOM specification</p>
            </method>

            <method name="getData" synopsis="$content = $node->getData()">
                <p>
                    If the node has any content (such as stored in a
                    <em>text node</em>) it can get requested through
                    this function.
                </p>
            </method>

            <method name="nodeValue" synopsis="$content = $node->nodeValue;">
                <p>
                    Alias for <st>getData</st>
                </p>
            </method>

            <method name="getType" 
                    synopsis="$type = $node->getType();">
                <p>
                    Retrun the node's type. The possible types are
                    described in the libxml2 <st>tree.h</st>
                    documentation. The return value of this function
                    is a numeric value. Therefore it differst with the
                    result of perl ref function.
                </p>
            </method>

            <method name="nodeType"
                    synopsis="$type = $node->nodeType;">
                <p>
                    Alias for <st>getType</st>.
                </p>
            </method>

            <method name="unbindNode" synopsis="$node->unbindNode()"> 
                <p>
                    Unbinds the Node from its siblings and Parent, but
                    not from the Document it belongs to. If the node
                    is not inserted into the DOM afterwards it will be
                    lost after the programm terminated. From a low
                    level view, the unbound node is stripped from the
                    context it is and inserted into a (hidden)
                    document-fragment.
                </p>
            </method>

            <method name="removeChild" 
                    synopsis="$childnode = $node->removeChild( $childnode )">
                <p>
                    This will unbind the Child Node from its parent
                    <em>$node</em>. The function returns the unbound
                    node.  If <em>oldNode</em> is not a child of the
                    given Node the function will fail.
                </p>
            </method>

            <method name="replaceChild" 
                    synopsis="$oldnode = $node->replaceChild( $newNode, $oldNode )">
                <p>
                    Replaces the <em>$oldNode</em> with the
                    <em>$newNode</em>. The <em>$oldNode</em> will be
                    unbound from the Node. This function differs from
                    the DOM L2 specification, in the case, if the new
                    node is not part of the document, the node will be
                    imported first.
                </p>
            </method>
            <method name="replaceNode" synopsis="$node->replaceNode($newNode);">
		<p>
		    This function is very similar to replaceChild(), but it 
		    replaces the node itself rather than a childnode. This is 
		    useful if a node found by any XPath function, should be 
                    replaced.
		</p>
            </method>

            <method name="appendChild"
                    synopsis="$childnode = $node->appendChild( $childnode )">
                <p>
                    The function will add the <em>$childnode</em> to
                    the end of <em>$node</em>'s children. The function
                    should fail, if the new childnode is allready a
                    child of <em>$node</em>. This function differs
                    from the DOM L2 specification, in the case, if the
                    new node is not part of the document, the node
                    will be imported first.
                </p>
            </method>

            <method name="addSibling" synopsis="$node->addSibling($newNode);">
                <p>
		    addSibling() allows to add an additional node to the end of 
                    a nodelist, defined by the given node.
		</p>
	    </method>

            <method name="cloneNode" 
                    synopsis="$newnode =$node->cloneNode( $deep )">
                <p>
                    <st>cloneNode</st> creates a copy of
                    <em>$node</em>. Wether $deep is set to 1 (true)
                    the function will copy all childnodes as well. If
                    $deep is 0 only the current node will be copied.
                </p>
            </method>
            <method name="attributes" synopsis="@attrs =$node->attributes;">
		<p>
		    This function returns all attributes assigned to the 
                    given node. if this function is called in scalar context, 
		    it will return a XML::LibXML::NodeList.  
		</p>
            </method>

            <method name="getParentNode" 
                    synopsis="$parentnode = $node->getParentNode();">
                <p>
                    Returns simply the Parent Node of the current node. 
                </p>
            </method>

            <method name="parentNode" synopsis="$parentnode = $node->parentNode;">
                <p>
                    Alias for <st>getParentNode()</st>
                </p>
            </method>

            <method name="getNextSibling" 
                    synopsis="$nextnode = $node->getNextSibling()">
                <p>
                    Returns the next sibling if any .
                </p>
            </method>

            <method name="nextSibling" 	
                    synopsis="$nextnode = $node->nextSibling()">
                <p>
                    Alias for <st>getNextSibling()</st>
                </p>
            </method>

            <method name="getPreviousSibling" 
                    synopsis="$nextnode = $node->getPreviousSibling()">
                <p>
                    Analogous to <st>getNextSibling</st> the function
                    returns the previous sibling if any.
                </p>
            </method>

            <method name="previousSibling" 	
                    synopsis="$prevnode = $node->previousSibling()">
                <p>
                    Alias for <st>getPreviousSibling()</st>
                </p>
            </method>

            <method name="hasChildNodes"
                    synopsis="$boolean = $node->hasChildNodes();"> 
                <p>
                    If the current node has Childnodes this function
                    returns TRUE (1), otherwise it returns FALSE (0,
                    not undef).
                </p>
            </method>

            <method name="getFirstChild"
                    synopsis="$childnode = $node->getFirstChild()">
                <p>
                    If a node has childnodes this function will return
                    the first node in the childlist.
                </p>
            </method>

            <method name="firstChild" 	synopsis="$childnode = $node->firstChild;">
                <p>
                    Alias for <st>getFirstChild()</st>
                </p>
            </method>

            <method name="getLastChild"
                    synopsis="$childnode = $node->getLastChild()">
                <p>
                    If the <em>$node</em> has childnodes this function
                    returns the last child node.
                </p>
            </method>

            <method name="lastChild" synopsis="$childnode = $node->lastChild;">
                <p>
                    Alias for <st>getLastChild()</st>
                </p>
            </method>

            <method name="getOwnerDocument"
                    synopsis="$dom = $node->getOwnerDocument()">
                <p>
                    Through this function it is allways possible to
                    access the document the current node is bound to.
                </p>
            </method>

            <method name="ownerDocument"
                    synopsis="$documentnode = $node->ownerDocument;">
                <p>
                    Alias for <st>getOwnerDocument()</st>
                </p>
            </method>

            <method name="getOwner"
                    synopsis="$node = $node->getOwner;">
                <p>
                    This function returns the node the current node is
                    associated with. In the very most cases this will
                    be a document node or a document fragment node.
                </p>
            </method>

            <method name="setOwnerDocument" 
                    synopsis="$node->setOwnerDocument( $dom );">
                <p>
                    This function binds a node to another DOM. This
                    method unbinds the node first, if it is allready
                    bound to another document.
                </p>
                <p>
                    Note that this is only safe with single nodes but not 
                    with subtrees. In case of subtrees one should use 
                    XML::LibXML::Document's importNode method.
                </p>
            </method>

            <method name="insertBefore" 
                    synopsis="$node->insertBefore( $newNode, $refNode )"> 
                <p>
                    The method inserts <em>$newNode</em> before
                    <em>$refNode</em>. If <em>$refNode</em> is
                    undefined, the newNode will be set as the new
                    first child of the parent node.  This function
                    differs from the DOM L2 specification, in the
                    case, if the new node is not part of the document,
                    the node will be imported first.
                </p>
            </method>

            <method name="insertAfter"
                    synopsis="$node->insertAfter( $newNode, $refNode )">
                <p>
                    The method inserts <em>$newNode</em> after
                    <em>$refNode</em>. If <em>$refNode</em> is
                    undefined, the newNode will be set as the new last
                    child of the parent node.
                </p>
            </method>

            <method name="findnodes" 
                    synopsis="@nodes = $node->findnodes( $xpath_statement );">
                <p>
                    <st>findnodes</st> performs the xpath statement on
                    the current node and returns the result as an
                    array. In scalar context returns a
                    <em>XML::LibXML::NodeList</em> object.
                </p>
            </method>

            <method name="find"
                    synopsis="$result = $node->find( $xpath );">
                <p>
                    <st>find</st> performs the xpath expression using
                    the current node as the context of the expression,
                    and returns the result depending on what type of
                    result the XPath expression had. For example, the
                    XPath "1 * 3 + 52" results in a
                    <em>XML::LibXML::Number</em> object being
                    returned. Other expressions might return a
                    <em>XML::LibXML::Boolean</em> object, or a
                    <em>XML::LibXML::Literal</em> object (a
                    string). Each of those objects uses Perl's
                    overload feature to "do the right thing" in
                    different contexts.
                </p>
            </method>

            <method name="findvalue"
                    synopsis="print $node->findvalue( $xpath );">
                <p>
                    <st>findvalue</st> is exactly equivalent to:
                </p>
                <example>
 $node->find( $xpath )-&gt;to_literal;
                </example>
                <p>
                    That is, it returns the literal value of the
                    results. This enables you to ensure that you get a
                    string back from your search, allowing certain
                    shortcuts. This could be used as the equivalent of
                    &lt;xsl:value-of select="some_xpath"/&gt;.
                </p>
            </method>

            <method name="getChildnodes"
                    synopsis="@children = $node->getChildnodes();">
                <p>
                    Alias for <st>childNodes()</st>
                </p>
            
            </method>

            <method name="childNodes"
                    synopsis="@childnodes = $node->childNodes;">
                <p>
                    <st>getChildnodes</st> implements a more intuitive
                    interface to the childnodes of the current
                    node. It enables you to pass all children directly
                    to a <em>map</em> or <em>grep</em>. If this
                    function is called in scalar context, the number
                    of childnodes will be returned.
                </p>
                </method>

            <method name="toString"
                    synopsis="$xmlstring = $node->toString();">
                <p>
                    This is the equivalent to
                    <em>XML::LibXML::Document::toString</em> for a
                    single node. This means a node and all its
                    childnodes will be dumped into the result string.
                </p>
                <p>
                    There is no formating implemented yet, which may
                    cause an unreadable output.
                </p>
            </method>

            <method name="getLocalName" 
                    synopsis="$name = $node->getLocalName();">
                <p>
                    Returns the local name of a tag. This is the part
                    behind the colon.
                </p>
            </method>

            <method name="localname" synopsis="$localname = $node->localname;">
                <p>
                    Alias for <st>getLocalName()</st>
                </p>
            </method>

            <method name="getPrefix" 
                    synopsis="$name = $node->getPrefix();">
                <p>
                    Returns the prefix of a tag. This is the part
                    before the colon.
                </p>
            </method>

            <method name="prefix" synopsis="$nameprefix = $node->prefix;">
                <p>
                    Alias for <st>getPrefix()</st>
                </p>
            </method>

            <method name="getNamespaceURI"
                    synopsis="$uri = $node->getNamespaceURI()">
                <p>
                    returns the URI of the current namespace.
                </p>
            </method>


            <method name="hasAttributes"
                    synopsis="$boolean = $node->hasAttributes();">
                <p>
                    returns 1 (TRUE) if the current node has any
                    attributes set, otherwise 0 (FALSE) is returned.
                </p>
            </method>



            <method name="getAttributesNS" 
                    synopsis="@attributelist = $node->attributesNS( $URI );">
                <p>
                    returns all attributes for the given namespace.
                    (not implemented yet)
                </p>
            </method>

            <method name="getNamespaces"
                    synopsis="@nslist = $node->getNamespaces();">
                <p>
                    returns all the namespace declaration nodes bound
                    to this node. The items are instances of the class
                    XML::LibXML::Namespace.
                </p>
            </method>

            <method name="iterator"
                    synopsis="$node->iterator( \&amp;nodehandler );">
                <p>
                    This is little helper function, that lets one
                    define a function, that will be processed on the
                    current node and all its children. The function
                    will recieve as its only parameter the node to
                    proceed. The function uses inorder proceeding to
                    traverse the subtree. Therefore you can't reach
                    the childnodes anymore, if the nodehandler removes
                    childnodes.
                </p>

                <example><![CDATA[
 $node->iterator( sub { print $_[0]->nodeName(),"\n"; } );
                ]]></example>

                <p>
                    The example will print all node names in the current subtree.
                </p>
                <p>
                    The <st>iterator</st> function will return the
                    return value of the nodehandler while processing
                    the last child of the current node.
                </p>
            </method>

            <method name="normalize" synopsis="$node->normalize">
                 <p>
                   This function normalizes adjacent textnodes. This
                   function is not as strict as libxml2's
                   xmlTextMerge() function, since it will not free a
                   node that is still refered by the perl layer.
                 </p>
            </method>

        </description>
        <also>
            <item name="XML::LibXML"/>
            <item name="XML::LibXML::Element"/>
            <item name="XML::LibXML::Text"/>
            <item name="XML::LibXML::Comment"/>
            <item name="XML::LibXML::Attr"/>
            <item name="XML::LibXML::DocumentFragment"/>
        </also>
    </package>

    <package name="XML::LibXML::Element">
        <short>The DOM Element Class</short>
        <description>

            <method name="new"
                    synopsis="$node = XML::LibXML::Element->new( $name )">
                <p>
                    This function creates a new node unbound to any DOM.
                </p>
            </method>

            <method name="setAttribute"
                    synopsis="$node->setAttribute( $aname, $avalue );">
                <p>
                    This method sets or replaces the node's attribute
                    <em>$aname</em> to the value <em>$avalue</em>
                </p>
            </method>

            <method name="setAttributeNS"
                    synopsis="$node->setAttributeNS( $nsURI, $aname, $avalue );">
                <p>
                    Namespaceversion of <em>setAttribute</em>.
                </p>
            </method>

            <method name="getAttribute" 
                    synopsis="$avalue = $node->getAttribute( $aname );">
                <p>
                    If <em>$node</em> has an attribute with the name
                    <em>$aname</em>, the value of this attribute will
                    get returned.
                </p>
            </method>

            <method name="getAttributeNS"
                    synopsis="$avalue = $node->setAttributeNS( $nsURI, $aname );">
                <p>
                    Namespaceversion of <em>getAttribute</em>.
                </p>
            </method>

            <method name="getAttributeNode"
                    synopsis="$attrnode = $node->getAttributeNode( $aname );">
                <p>
                    Returns the attribute as a node if the attribute
                    exists. If the Attribute does not exists
                    <em>undef</em> will be returned.
                </p>
            </method>

            <method name="getAttributeNodeNS"
                    synopsis="$attrnode = $node->getAttributeNodeNS( $namespaceURI, $aname );">
                <p>
                    Namespaceversion of <em>getAttributeNode</em>. 
                </p>
            </method>

            <method name="removeAttribute"
                    synopsis="$node->removeAttribute( $aname );">
                <p>
                    The method removes the attribute <em>$aname</em>
                    from the node's attribute list, if the attribute
                    can be found.
                </p>
            </method>

            <method name="removeAttributeNS"
                    synopsis="$node->removeAttributeNS( $nsURI, $aname );">
                <p>
                    Namespace version of <em>removeAttribute</em>
                </p>
            </method>

            <method name="hasAttribute"
                    synopsis="$boolean = $node->hasAttribute( $aname );">
                <p>
                    This funcion tests if the named attribute is set
                    for the node. If the attribute is specified, TRUE
                    (1) will be returned, otherwise the returnvalue is
                    FALSE (0).
                </p>
            </method>

            <method name="hasAttributeNS"
                    synopsis="$boolean = $node->hasAttributeNS( $nsURI, $aname );">
                <p>
                    namespace version of <em>hasAttribute</em>
                </p>
            </method>

            <method name="getChildrenByTagName" 
                    synopsis="@nodes = $node->getChildrenByTagName($tagname);">
                <p>
                    The function gives direct access to all childnodes
                    of the current node with the same tagname. It
                    makes things a lot easier if you need to handle
                    big datasets.
                </p>
                <p>
                    If this function is called in SCALAR context, it
                    returns the number of Elements found.
                </p>
            </method>

            <method name="getChildrenByTagNameNS" 
                    synopsis="@nodes = $node->getChildrenByTagNameNS($nsURI,$tagname);">
                <p>
                    Namespace version of <em>getChildrenByTagName</em>.
                </p>
                <p>
                    If this function is called in SCALAR context, it
                    returns the number of Elements found.
                </p>
            </method>

            <method name="getElementsByTagName"
                    synopsis="@nodes = $node-&gt;getElementsByTagName($tagname);">
                <p>
                    This function is part of the spec it fetches all
                    descendants of a node with a given tagname. If one
                    is as confused with <em>tagname</em> as I was,
                    tagname is a qualified tagname which is in case of
                    namespace useage prefix and local name
                </p>
                <p>
                    In SCALAR context this function returns a
                    <em>XML::LibXML::NodeList</em> object.
                </p>
            </method>

            <method name="getElementsByTagNameNS" 
                    synopsis="@nodes = $node->getElementsByTagNameNS($nsURI,$localname);">
                <p>
                    Namespace version of <em>getElementsByTagName</em>
                    as found in the DOM spec.
                </p>
                <p>
                    In SCALAR context this function returns a
                    <em>XML::LibXML::NodeList</em> object.
                </p>
            </method>

            <method name="getElementsByLocalName" 
                    synopsis="@nodes = $node->getElementsByLocalName($localname);">
                <p>
                    This function is not found in the DOM
                    specification. It is a mix of getElementsByTagName
                    and getElementsByTagNameNS. It will fetch all tags
                    matching the given local-name. This alows one to
                    select tags with the same local name across
                    namespace borders.
                </p>
                <p>
                    In SCALAR context this function returns a
                    <em>XML::LibXML::NodeList</em> object.
                </p>
            </method>

            <method name="appendWellBalancedChunk" 
                    synopsis="$node->appendWellBalancedChunk( $chunk )">
                <p>
                    Sometimes it is nessecary to append a string coded
                    XML Tree to a
                    node. <st>appendWellBalancedChunk</st> will do the
                    trick for you.  But this is only done if the
                    String is <em>well-balanced</em>.
                </p>
            </method>

            <method name="appendText" 
                    synopsis="$node->appendText( $PCDATA );">
                <p>
                    alias for appendTextNode().
                </p>
            </method>

            <method name="appendTextNode"
                    synopsis="$node->appendTextNode( $PCDATA );">
                <p>
                    This wrapper function lets you add a string
                    directly to an element node.
                </p>
            </method>

            <method name="appendTextChild" 
                    synopsis="$node->appendTextChild( $childname , $PCDATA )">
                <p>
                    Somewhat similar with <em>appendTextNode</em>: It
                    lets you set an Element, that contains only a
                    <em>text node</em> directly by specifying the name
                    and the text content.
                </p>
            </method>

        </description>
        <also>
            <item name="XML::LibXML"/>
            <item name="XML::LibXML::Node"/>
            <item name="XML::LibXML::Document"/>
            <item name="XML::LibXML::Attr"/>
            <item name="XML::LibXML::Text"/>
            <item name="XML::LibXML::Comment"/>
            <item name="XML::LibXML::DocumentFragment"/>
        </also>
    </package>

    <package name="XML::LibXML::Text">
        <short>The DOM Text Node Class</short>
        <description>
            <p>
                Different to the DOM specification XML::LibXML
                implements the text node as the base class of all
                character data node. Therefor there exists no
                CharacterData class. This allow one to use all methods
                that are available for textnodes as well for Comments
                or CDATA-sections.
            </p>

            <method name="new"
                    synopsis="$text = XML::LibXML::Text->new( $content ); ">
                <p>
                    The constuctor of the class. It creates an unbound text node.
                </p>
            </method>

            <method name="data"
                    synopsis="$nodedata = $text->data;">
                <p>
                    Although there exists the <em>nodeValue</em>
                    attribute in the Node class, the DOM specification
                    defines data as a separate
                    attribute. <em>XML::LibXML</em> implements these
                    two attributes not as different attributes, but as
                    aliases, such as <em>libxml2</em> does. Therefore 
                </p>
                <example><![CDATA[
 $text->data
                ]]></example>
                <p>and</p>
                <example><![CDATA[
 $text->nodeValue
                ]]></example>
                <p>
                    will have the same result and are not different
                    entities.
                </p>
            </method>

            <method name="setData($string)"
                    synopsis="$text->setData( $text_content );">
                <p>
                    This function sets or replaces text content to a
                    node. The node has to be of the type "text",
                    "cdata" or "comment".
                </p>
            </method>

            <method name="substringData($offset,$length)"
                    synopsis="$text->substringData($offset, $length);">
                <p>
                    Extracts a range of data from the node. (DOM Spec)
                    This function takes the two parameters $offset and
                    $length and returns the substring if available.
                </p>
                <p>
                    If the node contains no data or $offset referes to
                    an nonexisting string index, this function will
                    return <st>undef</st>. If $length is out of range
                    <em>substringData</em> will return the data
                    starting at $offset instead of causing an error.
                </p>
            </method>

            <method name="appendData($string)"
                    synopsis="$text->appendData( $somedata );">
                <p>
                    Appends a string to the end of the existing
                    data. If the current text node contains no data,
                    this function has the same effect as
                    <em>setData</em>.
                </p>
            </method>

            <method name="insertData($offset,$string)"
                    synopsis="$text->insertData($offset, $string);">
                <p>
                    Inserts the parameter $string at the given $offset
                    of the existing data of the node. This operation
                    will not remove existing data, but change the
                    order of the existing data.
                </p>
                <p>
                    The $offset has to be a positive value. If $offset
                    is out of range, <em>insertData</em> will have the
                    same behaviour as <em>appendData</em>.
                </p>
            </method>

            <method name="deleteData($offset, $length)"
                    synopsis="$text->deleteData($offset, $length);">
                <p>
                    This method removes a chunk from the existing node
                    data at the given offset. The $length parameter
                    tells, how many characters should be removed from
                    the string.
                </p>
            </method>

            <method name="deleteDataString($string, [$all])"
                    synopsis="$text->deleteDataString($remstring, $all);">
                <p>
                    This method removes a chunk from the existing node
                    data. Since the DOM spec is quite unhandy if you
                    already know <em>which</em> string to remove from
                    a text node, this method allows more perlish code :)
                </p>
                <p>
                    The functions takes two parameters:
                    <st>$string</st> and optional the <st>$all</st>
                    flag. If $all is not set, <st>undef</st> or
                    <st>0</st>, <em>deleteDataString</em> will remove
                    only the first occourance of $string. If $all is
                    <st>TRUE</st> <em>deleteDataString</em> will
                    remove all occourences of <st>$string</st> from
                    the node data.
                </p>
            </method>

            <method name="replaceData($offset, $length, $string)"
                    synopsis="$text->replaceData($offset, $length, $string);">
                <p>
                    The DOM style version to replace node data.
                </p>
            </method>

            <method name="replaceDataString($oldstring, $newstring, [$all])"
                    synopsis="$text->replaceDataString($old, $new, $flag);">
                <p>
                    The more programmer friendly version of replaceData() :)
                </p>
                <p>
                    Instead of giving offsets and length one can
                    specify the exact string (<st>$oldstring</st>) to
                    be replaced. Additionally the <st>$all</st> flag
                    allows to replace all occourences of
                    <st>$oldstring</st>.
                </p>
            </method>
            
            <method name="replaceDataRegEx( $search_cond, $replace_cond, $reflags )"
                    synopsis="$text->replaceDataRegEx( $search_cond, $replace_cond, $reflags );">
                <p>
                    This method replaces the node's data by a
                    <em>simple</em> regular expression. Optional, this
                    function allows to pass some flags that will be
                    added as flag to the replace statement.
                </p>
                <p>
                    <st>NOTE:</st> This is a shortcut for
                </p>
                <example><![CDATA[
 my $datastr = $node->getData();
 $datastr =~ s/somecond/replacement/g; # 'g' is just an example for any flag
 $node->setData( $datastr );
                    ]]></example>

                <p>
                    This function can make things easier to read for
                    simple replacements. For more complex variants it
                    is recommented to use the code snippet above.
                </p>
            </method>

        </description>
        <also>
            <item name="XML::LibXML"/>
            <item name="XML::LibXML::Node"/>
            <item name="XML::LibXML::Element"/>
            <item name="XML::LibXML::Document"/>
            <item name="XML::LibXML::Comment"/>
            <item name="XML::LibXML::DocumentFragment"/>
        </also>
    </package>

    <package name="XML::LibXML::Comment">
        <short>The DOM Comment Class</short>
        <description>
            <p>
                This class provides all functions of
                <st>XML::LibXML::Text</st>, but for comment
                nodes. This can be done, since only the output of the
                nodetypes is different, but not the datastructure. :-)
            </p>

            <method name="new" synopsis="$node = XML::LibXML::Comment( $content );">
                <p>
                    The constructor is the only provided function for
                    this package. It is required, because
                    <st>libxml2</st> treats text nodes and comment
                    nodes slightly different.
                </p>
            </method>

        </description>
        <also>
            <item name="XML::LibXML"/>
            <item name="XML::LibXML::Node"/>
            <item name="XML::LibXML::Element"/>
            <item name="XML::LibXML::Text"/>
            <item name="XML::LibXML::Document"/>
            <item name="XML::LibXML::DocumentFragment"/>
        </also>
    </package>

    <package name="XML::LibXML::CDATASection">
        <short>The DOM CDATASection Class</short>
        <description>
            <p>
                This class provides all functions of
                <st>XML::LibXML::Text</st>, but for CDATA nodes.
            </p>
           
            <method name="new" synopsis="$node = XML::LibXML::Comment( $content );">
                <p>
                    The constructor is the only provided function for
                    this package. It is required, because
                    <st>libxml2</st> treats the different textnode
                    types slightly different.
                </p>
            </method>

        </description>
        <also>
            <item name="XML::LibXML"/>
            <item name="XML::LibXML::Node"/>
            <item name="XML::LibXML::Element"/>
            <item name="XML::LibXML::Text"/>
            <item name="XML::LibXML::Document"/>
            <item name="XML::LibXML::DocumentFragment"/>
        </also>
    </package>

    <package name="XML::LibXML::Attr">
        <short>The DOM Attribute Class</short>
        <description>
            <p>
                This is the interface to handle Attributes like
                ordinary nodes. The naming of the class relies on the
                W3C DOM documentation.
            </p>

            <method name="new" 
                    synopsis="$attr = XML::LibXML::Attr->new($name [,$value]);">
                <p>
                    Class constructor. If you need to work with iso
                    encoded strings, you should <st>allways</st> use
                    the <em>createAttrbute</em> of
                    <st>XML::LibXML::Document</st>.
                </p>
            </method>

            <method name="getValue" synopsis="$string = $attr->getValue();">
                <p>
                    Returns the value stored for the attribute. If
                    undef is returned, the attribute has no value,
                    which is different of being <em>not
                    specified</em>.
                </p>
            </method>


            <method name="value" synopsis="$value = $attr->value;">
                <p>
                    Alias for <st>getValue()</st>
                </p>
            </method>


            <method name="setValue" synopsis="$attr->setValue( $string );">
                <p>
                    This is needed to set a new attributevalue. If iso
                    encoded strings are passed as parameter, the node
                    has to be bound to a document, otherwise the
                    encoding might be wrong done.
                </p>
            </method>

            <method name="getOwnerElement"
                    synopsis="$node = $attr->getOwnerDocument();">
                <p>
                    returns the node the attribute belongs to. If the
                    attribute is not bound to a node, undef will be
                    returned. Overwriting the underlaying
                    implementation, the <st>parentNode</st> function
                    will return undef, instead of the owner element.
                </p>
            </method>

        </description>
        <also>
            <item name="XML::LibXML"/>
            <item name="XML::LibXML::Node"/>
            <item name="XML::LibXML::Element"/>
            <item name="XML::LibXML::Document"/>
            <item name="XML::LibXML::DocumentFragment"/>
        </also>
    </package>

    <package name="XML::LibXML::DocumentFragment">
        <short>DOM L2 Implementation of a Document Fragment</short>
        <description>
            <p>
                This class is a helper class as described in the DOM
                Level 2 Specification.  It is implamented as a node
                without name. All adding, inserting or replacing
                functions are aware about document fragments now.
            </p>
            <p>
                As well <st>all</st> unbound nodes (all nodes that
                does not belong to any document subtree) are implicit
                member of document fragments.
            </p>
        </description>
        <also>
            <item name="XML::LibXML"/>
            <item name="XML::LibXML::Node"/>
            <item name="XML::LibXML::Element"/>
            <item name="XML::LibXML::Document"/>
            <item name="XML::LibXML::Text"/>
            <item name="XML::LibXML::Comment"/>
            <item name="XML::LibXML::CDATASection"/>
        </also>
    </package>

    <package name="XML::LibXML::Namespace">
        <short>A Namespace Class to hold namespace nodes</short>
        <description>
            <p>
                Namespace nodes are returned by both
                $element->findnodes('namespace::foo') or by
                $node->getNamespaces().
            </p>
            <p>
                The namespace node API is not part of any current DOM
                API, and so it is quite minimal. It should be noted
                that namespace nodes are <st>not</st> a sub class of
                XML::LibXML::Node, however Namespace nodes act a lot
                like attribute nodes, and similarly named methods will
                return what you would expect if you treated the
                namespace node as an attribute.
            </p>
            
            <method name="getName" synopsis="print $ns->getName()">
                <p>
                    Returns "xmlns:prefix", where prefix is the prefix
                    for this namespace.
                </p>
            </method>

            <method name="name" synopsis="print $ns->name()">
                <p>
                    Alias for getName()
                </p>
            </method>

            <method name="prefix" synopsis="print $ns->prefix()">
                <p>
                    Returns the prefix bound to this namespace declaration.
                </p>
            </method>

            <method name="getLocalName" synopsis="$localname = $ns->getLocalName()">
                <p>
                    Alias for prefix()
                </p>
            </method>

            <method name="getData" synopsis="print $ns->getData()">
                <p>
                    Returns the URI of the namespace.
                </p>
            </method>

            <method name="getValue" synopsis="print $ns->getValue()">
                <p>
                    Alias for getData()
                </p>
            </method>

            <method name="value" synopsis="print $ns->value()">
                <p>
                    Alias for getData()
                </p>
            </method>

            <method name="uri" synopsis="print $ns->uri()">
                <p>
                    Alias for getData()
                </p>
            </method>

            <method name="getNamespaceURI" 
                    synopsis="$known_uri = $ns->getNamespaceURI()">
                <p>
                    Returns the string "http://www.w3.org/2000/xmlns/"
                </p>
            </method>

            <method name="getPrefix"
                    synopsis="$known_prefix = $ns->getPredix()">
                <p>
                    Returns the string "xmlns"
                </p>
            </method>
        </description>
    </package>

    <package name="XML::LibXML::Dtd">
        <short>A Class implementing Dtd Nodes</short>
        <description>
            <p>
                This class holds a DTD. You may parse a DTD from
                either a string, or from an external SYSTEM
                identifier.
            </p>
            <p>
                No support is available as yet for parsing from a
                filehandle.
            </p>
            <p>
                XML::LibXML::Dtd is a sub-class of Node, so all the
                methods available to nodes (particularly toString())
                are available to Dtd objects.
            </p>

            <method name="new" 
                    synopsis="$dtd = XML::LibXML::Dtd->new($public_id, $system_id)">
                <p>
                    Parse a DTD from the system identifier, and return
                    a DTD object that you can pass to $doc->is_valid()
                    or $doc->validate().
                </p>
  
                <example><![CDATA[
 my $dtd = XML::LibXML::Dtd->new(
                      "SOME // Public / ID / 1.0",
                      "test.dtd"
                                );
 my $doc = XML::LibXML->new->parse_file("test.xml");
 $doc->validate($dtd);
                    ]]></example>
            </method>

            <method name="parse_string"
                    synopsis="$dtd = XML::LibXML::Dtd->parse_string($dtd_str)">
                <p>
                    The same as new() above, except you can parse a
                    DTD from a string.
                </p>
            </method>
        </description>
    </package>
</module>