Difference between revisions of "Querying"
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| Additional [[Higher-Order Functions]] that aren't in the standard libraries. | | Additional [[Higher-Order Functions]] that aren't in the standard libraries. | ||
| <code>hof</code> | | <code>hof</code> |
Revision as of 02:56, 1 March 2012
Welcome to the Query Portal, which is one of the Main Sections of this documentation. BaseX provides an implementation of the W3 XPath and XQuery languages, which are tightly coupled with the underlying database store. High conformance with the official specifications is one of our main objectives, as the results of the XQuery Test Suite demonstrate. This section contains general information on the query processor and its numerous extensions.
Features
- XQuery 3.0: supported features of the upcoming XQuery 3.0 Recommendation
- 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: how to access and call Java code from XQuery
- Packaging: embedding of external function modules, based on the EXPath Packaging System
- Errors: errors raised by XQuery expressions
- Serialization: serialization parameters supported by BaseX
Modules
Beside the standard XQuery Functions, BaseX offers additional function modules, which are listed in the following table. All modules are statically bound, which means that they need not (but may) be explicitly declared in the query prolog.
Module | Description | Prefix | Namespace URI |
---|---|---|---|
Cryptography | Cryptographic functions, based on the EXPath Cryptograhic module. | 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
|
Higher-Order | Additional Higher-Order Functions that aren't in the standard libraries. | hof
|
http://basex.org/modules/hof
|
Index | Functions for requesting details on database indexes. Version 7.1 | index
|
http://basex.org/modules/index
|
JSON | Parsing and serializing JSON documents. | 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
|
Repository | Installing, deleting and listing packages. Version 7.1 | repo
|
http://basex.org/modules/repo
|
SQL | JDBC bridge to access relational databases. | 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
|