THE XML REVOLUTION - TECHNOLOGIES FOR THE FUTURE WEB

XQuery concepts

A query in XQuery is an expression that:

reads a sequence of XML fragments or atomic values
returns a sequence of XML fragments or atomic values

The principal forms of XQuery expressions are:

path expressions
element constructors
FLWOR ("flower") expressions
list expressions
conditional expressions
quantified expressions
datatype expressions

Expressions are evaluated relative to a context:

namespaces
variables
functions
date and time
context item (current node or atomic value)
context position (in the sequence being processed)
context size (of the sequence being processed)

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