Index Module

This XQuery Module provides 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.

Conventions

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:

• BXDB0001 is raised if $db references a node that is not stored in a database (i.e., references a main-memory XML fragment).
• BXDB0002 is raised if the addressed database cannot be opened.
• BXDB0004 is raised if the index required by a function is not available.

Functions

index:facets

Signatures	index:facets($db as item()) as xs:string index:facets($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:facets("DB") returns information about facets and facet values on the database DB in document structure. index:facets("DB", "flat") returns information about facets and facet values on the database DB in a summarized flat structure.

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.

Changelog

The module was introduced with Version 7.1.