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XQuery 1.0 and XPath 2.0 share the same data model and support the same functions and operators.
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XQuery Functions
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XQuery is built on XPath expressions. XQuery 1.0 and XPath 2.0 share the same data model and support the same functions and operators.
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XPath Operators
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XPath Functions
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XQuery Data Types
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XQuery shares the same data types as XML Schema 1.0 (XSD).
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XSD String
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XSD Date
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XSD Numeric
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XSD Misc
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