XML QUERY LANGUAGES: XQUERY AND XPATH The box

XML QUERY LANGUAGES: XQUERY AND XPATH The box titled XQuery Operators, Expressions, and Constructs Supported by SQL Server lists all the operators and expressions supported by SQL Server 2005 s implementation of XQuery. The list may change slightly by the time of release. XQuery Operators, Expressions, and Constructs Supported by SQL Server Supported Operators Numeric operators: +, -, *, / Value comparison operators: eq, ne, lt, gt, le, ge General comparison operators: =, !=, < , >, < =, >= Supported Expressions and Constructs Prolog with namespace declarations and schema imports Node comparison Order comparison Path expressions Constructors with evaluation Element and attribute dynamic constructors FWOR (no let) Conditional (if-then-else) Quantified expressions Note also that although the specification defined that each standard function live in a specific namespace, SQL Server s XQuery engine does not require the namespace prefix. This saves on required namespace declarations in every query. SQL Server XQuery Extended Functions Because the XQuery engine is executing in the context of a relational database, it is convenient to provide a standard way to use non-XML data (that is, relational data) inside the XQuery query itself. SQL Server provided

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