//Instantiate a Presentation object that represents a presentation file
Presentation pres = new Presentation("data/pptx4j/presentation.pptx");

//Accessing slides
for (ISlide slide : pres.getSlides())
{
    System.out.println(slide.getSlideNumber());         
}

try
{
    getInputFilePath(args);
}
catch (IllegalArgumentException e)
{
    inputfilepath = "data/pptx4j/pptx-basic.xml";
}

PresentationMLPackage pMLPackage = (PresentationMLPackage) OpcPackage
        .load(new java.io.File(inputfilepath));

SlidePart slide = (SlidePart) pMLPackage.getParts().get(
        new PartName("/ppt/slides/slide1.xml"));

new TraversalUtil(slide.getJaxbElement().getCSld().getSpTree()
        .getSpOrGrpSpOrGraphicFrame(),

new Callback()
{

    String indent = "";

    // @Override
    public List<Object> apply(Object o)
    {

        String text = "";

        try
        {
            System.out.println(indent
                    + o.getClass().getName()
                    + "\n\n"
                    + XmlUtils.marshaltoString(o, true,
                            org.pptx4j.jaxb.Context.jcPML));
        }
        catch (RuntimeException me)
        {
            System.out.println(indent + o.getClass().getName());
        }

        if (o instanceof org.pptx4j.pml.Shape)
        {
            CTTextBody txBody = ((org.pptx4j.pml.Shape) o).getTxBody();
            if (txBody != null)
            {
                for (CTTextParagraph tp : txBody.getP())
                {

                    System.out.println(indent
                            + tp.getClass().getName()
                            + "\n\n"
                            + XmlUtils
                                    .marshaltoString(
                                            tp,
                                            true,
                                            true,
                                            org.pptx4j.jaxb.Context.jcPML,
                                            "http://schemas.openxmlformats.org/presentationml/2006/main",
                                            "txBody",
                                            CTTextParagraph.class));

                }
            }
        }

        return null;
    }

    // @Override
    public boolean shouldTraverse(Object o)
    {
        return true;
    }

    // Depth first
    // @Override
    public void walkJAXBElements(Object parent)
    {

        indent += "    ";

        List children = getChildren(parent);
        if (children != null)
        {

            for (Object o : children)
            {

                // if its wrapped in javax.xml.bind.JAXBElement, get its
                // value
                o = XmlUtils.unwrap(o);

                this.apply(o);

                if (this.shouldTraverse(o))
                {
                    walkJAXBElements(o);
                }

            }
        }

        indent = indent.substring(0, indent.length() - 4);
    }

    // @Override
    public List<Object> getChildren(Object o)
    {
        return TraversalUtil.getChildrenImpl(o);
    }

}

);