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Gabriel Farrell committed 727d91d

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code4lib13/isis2couchdb.txt

+by Luciano Ramalho
+
 <h2>Abstract</h2>
 
 For decades bibliographic data has been stored in non-relational databases, and
 appears in the “Encyclopedia of Database Systems” (Liu, 2009):
 
 <blockquote>
-    The semi-structured data model is designed as an evolution of the relational
-    data model that allows the representation of data with a flexible structure.
-    Some items may have missing attributes, others may have extra attributes,
-    some items may have two or more occurrences of the same attribute. The type
-    of an attribute is also flexible: it may be an atomic value or it may be
-    another record or collection. Moreover, collections may be heterogeneous,
-    i.e., they may contain items with different structures. The semi-structured
-    data model is a self-describing data model, in which the data values and the
-    schema components co-exist.
+The semi-structured data model is designed as an evolution of the relational
+data model that allows the representation of data with a flexible structure.
+Some items may have missing attributes, others may have extra attributes,
+some items may have two or more occurrences of the same attribute. The type
+of an attribute is also flexible: it may be an atomic value or it may be
+another record or collection. Moreover, collections may be heterogeneous,
+i.e., they may contain items with different structures. The semi-structured
+data model is a self-describing data model, in which the data values and the
+schema components co-exist.
 </blockquote>
 
 Thanks to the semistructured data model, we don't need to feel ashamed of our
 <h2>Indexing and querying</h2>
 
 <h3>Building indexes</h3>
+
 For efficient retrieval, records must be indexed. It is useful to distinguish
 between a primary index and secondary indexes. A primary index allows retrieval
 via the primary key. Every NoSQL database uses a primary index to allow queries