XQuery TutorialLesson 70Free preview

XQuery Terms

This lesson is part of XML · All levels

Summary

The XQuery query is composed of two main parts: a prologue containing declarations and a play expression in the form of evaluated expressions. Prologues are used to declare the namespace, base URI, variable, and function to be used by the query. All prologue declarations are written with the keyword declare followed by semicolon as the separator of the statement.

Key points

XQuery = prologue + main expression
The prologue contains a declaration of namespace, base URI, variable, and function
Declaration form: declare namespace xf="http://...";
Declare variable $x:= value; for global variables
Declare function prefix:nama($a) {...}; for a custom made function

Full lesson

Code examples and quizzes

Full lessons, code examples, and quizzes are available to subscribers. 5 questions.