Querying
Welcome to the Query Portal, which is one of the Main Sections of this documentation. This page summarizes information on the XPath/XQuery languages and the non-standard extensions available in BaseX.
Features
- XQuery 3.0: supported features of the upcoming XQuery 3.0 and XPath 2.0 Recommendations
- Full-Text: XPath/XQuery Full Text extends the language with powerful retrieval features.
- Updates: Databases can be modified via the XQuery Update extension
- Java Bindings: described how Java code can be accessed and called from XQuery
- Packaging: allows to embed external function modules, based on the EXPath Packaging System
- Errors: errors raised by XQuery expressions
- Serialization: serialization parameters supported by BaseX
Modules
The namespaces of the following XQuery modules are statically bound in BaseX, i.e., they need not (but may) be declared in the query prolog.
| Module | Description | Prefix | Namespace URI |
|---|---|---|---|
| Cryptography | Cryptographic functions, based on the EXPath Cryptograhic module. Version 7.0 | crypto
|
http://expath.org/ns/crypto
|
| Database | Functions for accessing and updating databases. | db
|
http://basex.org/modules/db
|
| File | File handling, based on the latest draft of the EXPath File module. | file
|
http://expath.org/ns/file
|
| Full-Text | Functions for performing full-text operations. | ft
|
http://basex.org/modules/ft
|
| HTTP | Sending HTTP requests, based on the EXPath HTTP module. | http
|
http://expath.org/ns/http-client
|
| Index | Functions for requesting details on database indexes. Version 7.1 | index
|
http://basex.org/modules/index
|
| JSON | Parsing and serializing JSON documents. Version 7.0 | json
|
http://basex.org/modules/json
|
| Map | Functions for handling maps (key/value pairs). | map
|
http://www.w3.org/2005/xpath-functions/map
|
| Math | Mathematical operations, extending the W3C Working Draft. | math
|
http://www.w3.org/2005/xpath-functions/math
|
| Packaging | Installing, deleting and listing packages. Version 7.1 | pkg
|
http://basex.org/modules/repo
|
| SQL | JDBC bridge to access relational databases. Version 7.0 | sql
|
http://basex.org/modules/sql
|
| Utility | Utility functions, used for data conversions, profiling and dynamic evaluation. | util
|
http://basex.org/modules/util
|
| XSLT | Stylesheet transformations, based on Java’s and Saxon’s XSLT processor. | xslt
|
http://basex.org/modules/xslt
|
| ZIP | ZIP functionality, based on the EXPath ZIP module. | zip
|
http://expath.org/ns/zip
|
