Querying

Welcome to the Query Portal, which is one of the main sections of this 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
• XQuery 3.0: supported features of the upcoming W3C XQuery 3.0 Recommendation
• Java Bindings: how to call Java methods from XQuery

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 W3C Working Draft
  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 approved and planned XQuery 3.0 functions is found in the current W3C Working Draft.

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