Semistructured Data

Information Integration Via Semistructured Data

Unlike the other models we have discussed, data in the semistructured model is self-describing; the schema is attached to the data itself. That is, each node (except the root) has an arc or arcs entering it, and the labels on these arcs tell what role the node

XML and Its Data Model

XML (Extensible Markup Language) is a tag-based notation for "marking" documents, much similar to the familiar HTML or less familiar SGML. A document is nothing more nor less than a file of characters. However, while HMTL's tags talk about the presentation of the information

Attribute Lists

There is a strong relationship between XML documents and semistructured data. Assume that for some pair of matching tags and in a document we make a node n. Then, if and are matching tags nested directly within the pair and (i.e., there are no

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