Querying

Welcome to the Query Portal, which is one of the main sections of the documentation. Here your find more information on performing XPath and XQuery requests. Apart from standard features, BaseX offers numerous extensions, which are listed on this page.

Extensions

• Full-Text: full-text features of XQuery
• Update: update mechanism of XQuery
• Java Bindings: how to call Java methods from XQuery
• XQuery 3.0: supported features of the upcoming W3C XQuery 3.0 Recommendation

Functions

• Database: Database-related functions
  Prefix: db; URI: http://basex.org/db
• Full Text: Full-text functions
  Prefix: ft; URI: http://basex.org/ft
• Utility Functions: Testing and profiling functions
  Prefix: util; URI: http://basex.org/util
• File Functions: functions for file handling
  Prefix: file; URI: http://basex.org/file
• HTTP Functions (http): Full-text functions, based on the EXPath HTTP Client Module
  Prefix: http; URI: http://expath.org/ns/http-client
• Math Functions: functions for mathematical operations, extending the official W3C Recommendation
  Prefix: math; URI: http://www.w3.org/2005/xpath-functions/math

Note that all namespace URIs are statically bound in BaseX, i.e., they need not be declared in the query prolog. A complete list of the standard XQuery 3.0 functions is found in the Official W3C Specification.

Indexes

Queries will be analyzed and optimized for index access on the fly.

• Overview: All indexes and their functionality
• Execution Plan: Execution plans of the queries