'Element bar price' presentation slideshows

Lecture 5: XML and XQuery

Lecture 5: XML and XQuery. Semistructured Data. Another data model, based on trees. Motivation : flexible representation of data. Often, data comes from multiple sources with differences in notation, meaning, etc. Motivation : sharing of documents among systems and databases.

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XML Query Languages XPATH XQUERY

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XML Query Languages

XML Query Languages. XPATH XQUERY. XPATH and XQUERY. XPATH is a language for describing paths in XML documents. Really think of the semistructured data graph and its paths. XQUERY is a full query language for XML documents with power similar to OQL. Example DTD. <!DOCTYPE Bars [

372 views • 26 slides

XML Query Languages

XML Query Languages. XPATH XQUERY (non in programma). XPATH and XQUERY. XPATH is a language for describing paths in XML documents. Really think of the semistructured data graph and its paths. XQUERY is a full query language for XML documents with power similar to OQL. Example DTD.

345 views • 26 slides

XPath

XPath. Path Expressions Conditions. Paths in XML Documents. XPath is a language for describing paths in XML documents. Really think of the semistructured data graph and its paths. Example DTD. <!DOCTYPE BARS [ <!ELEMENT BARS (BAR*, BEER*)> <!ELEMENT BAR (PRICE+)>

326 views • 18 slides