Difference between revisions of "Index Module"
Jump to navigation
Jump to search
| Line 1: | Line 1: | ||
| − | This module | + | This module provides [[Querying#Functions|XQuery functions]] for displaying information stored in the database index structures. All functions are introduced with the {{Mono|index:}} prefix, which is linked to the statically declared {{Mono|http://basex.org/modules/index}} namespace. |
| − | + | =Commonalities= | |
All functions share {{Mono|$db}} as argument, which may either reference a string, denoting the name of the addressed database, or a node from an already opened database. The following errors may be raised by all functions: | All functions share {{Mono|$db}} as argument, which may either reference a string, denoting the name of the addressed database, or a node from an already opened database. The following errors may be raised by all functions: | ||
| Line 8: | Line 8: | ||
* <b>[[XQuery Errors#BaseX Errors|BASX0002]]</b> is raised if {{Mono|$db}} references a node that is not stored in a database (i.e., references a main-memory XML fragment). | * <b>[[XQuery Errors#BaseX Errors|BASX0002]]</b> is raised if {{Mono|$db}} references a node that is not stored in a database (i.e., references a main-memory XML fragment). | ||
* <b>[[XQuery Errors#BaseX Errors|BASX0003]]</b> is raised if the addressed database cannot be opened. | * <b>[[XQuery Errors#BaseX Errors|BASX0003]]</b> is raised if the addressed database cannot be opened. | ||
| + | |||
| + | =Functions= | ||
==index:facets== | ==index:facets== | ||
| Line 63: | Line 65: | ||
|Returns all attribute names stored in the index, along with their number of occurrences. | |Returns all attribute names stored in the index, along with their number of occurrences. | ||
|} | |} | ||
| + | |||
| + | =Recent Changes= | ||
| + | |||
| + | This module was introduced with Version 7.1. | ||
| + | |||
| + | [[Category:XQuery]] | ||
Revision as of 05:49, 7 February 2012
This module provides XQuery functions for displaying information stored in the database index structures. All functions are introduced with the index: prefix, which is linked to the statically declared http://basex.org/modules/index namespace.
Contents
Commonalities
All functions share $db as argument, which may either reference a string, denoting the name of the addressed database, or a node from an already opened database. The following errors may be raised by all functions:
- BASX0001 is raised if the index required by a function is not available.
- BASX0002 is raised if
$dbreferences a node that is not stored in a database (i.e., references a main-memory XML fragment). - BASX0003 is raised if the addressed database cannot be opened.
Functions
index:facets
| Signatures | index:facets($db as item()) as xs:stringindex:facets($db as item(), $type as xs:string) as xs:string
|
| Summary | Returns information about possible facets and facet values on a database in document structure format. If $type is specified as flat, the function returns this information in a flat summarized version.
|
| Examples |
|
index:texts
| Signatures | index:texts($db as item()) as element(value)*index:texts($db as item(), $prefix as xs:string) as element(value)*
|
| Summary | Returns all strings stored in the text index, along with their number of occurrences. If $prefix is specified, the returned nodes will be refined to the strings starting with that prefix.
|
index:attributes
| Signatures | index:attributes($db as item()) as element(value)*index:attributes($db as item(), $prefix as xs:string) as element(value)*
|
| Summary | Returns all strings stored in the attribute index, along with their number of occurrences. If $prefix is specified, the returned nodes will be refined to the strings starting with that prefix.
|
index:element-names
| Signatures | index:element-names($db as item()) as element(value)*
|
| Summary | Returns all element names stored in the index, along with their number of occurrences. |
index:attribute-names
| Signatures | index:attribute-names($db as item()) as element(value)*
|
| Summary | Returns all attribute names stored in the index, along with their number of occurrences. |
Recent Changes
This module was introduced with Version 7.1.
