Inspection Module

This XQuery Module contains functions for extracting internal information about modules and functions and generating documentation.

Conventions

All functions and errors in this module are assigned to the http://basex.org/modules/inspect namespace, which is statically bound to the inspect prefix.
xqDoc document instances are assigned to the http://www.xqdoc.org/1.0 namespace, which is statically bound to the xqdoc prefix.

Reflection

inspect:functions

Signatures	inspect:functions() as function(*)* inspect:functions($uri as xs:string) as function(*)*
Summary	Returns function items for all user-defined functions (both public and private) that are known in the current query context. If a $uri is specified, the specified resource will be retrieved as string and compiled, and its functions will be added to the query context and returned to the user. A relative URI will be resolved against the static base URI of the query.
Examples	Invokes the declared functions and returns their values: declare %private function local:one() { 12 }; declare %private function local:two() { 34 }; for $f in inspect:functions() return $f() Compiles all functions in code.xqm and invokes the function named run: let $uri := 'code.xqm' let $name := "run" for $f in inspect:functions($uri) where local-name-from-QName(function-name($f)) = $name return $f()

inspect:function-annotations

Signatures	inspect:function-annotations($function as function(*)?) as map(xs:QName, xs:anyAtomicType*)
Summary	Returns the annotations of the specified $function in a map.
Examples	Returns an empty map: inspect:function-annotations(true#0) Returns a map with a single key Q{http://www.w3.org/2012/xquery}private and an empty sequence as value: declare %private function local:f() { 'well hidden' }; inspect:function-annotations(local:f#0)

inspect:static-context

Signatures	inspect:static-context($function as function(*)?, $name as xs:string) as item()*
Summary	Returns a component of the static context of a $function with the specified $name. If no function is supplied, the current static context is considered. The following components can be requested: base-uri: Static base URI. namespaces: Prefix/URI map with all statically known namespaces. element-namespace: Default element/type namespace URI, or an empty sequence if it is absent. function-namespace: Default function namespace URI, or an empty sequence if it is absent. collation: URI of the default collation. ordering: Ordering mode (ordered/unordered) construction: Construction mode (preserve/strip) default-order-empty: Default order for empty sequences (greatest/least) boundary-space: Boundary-space policy (preserve/strip) copy-namespaces: Copy-namespaces mode (inherit/no-inherit, preserve/no-preserve) decimal-formats: Nested map with all statically known decimal formats
Examples	Returns the static base URI (same as static-base-uri()): inspect:static-context((), 'base-uri') Returns a map with all namespaces that are statically known in the module of the specified function: import module namespace data = 'data.xqm'; inspect:static-context(data:get#1, 'namespaces')
Errors	unknown: The specified component does not exist.

Documentation

inspect:type

Signatures	inspect:type($value as item()*) as xs:string
Summary	Returns a string representation of the type of a value: The string includes the occurrence indicator. The type of functions and nodes may be stricter than the returned type. For type checking, the standard expressions typeswitch and instance of should be used instead.
Examples	inspect:type(1 to 100) returns xs:integer+ inspect:type(map { 'a': (1, 2)[. = 1] }) returns map(*); a stricter type representation would be map(xs:string, xs:string) inspect:type(<a/>) returns element(); a stricter type representation would be element(a)

inspect:function

Signatures	inspect:function($function as function(*)) as element(function)
Summary	Inspects the specified $function and returns an element that describes its structure. The output of this function is similar to eXist-db’s inspect:inspect-function function.
Examples	The query inspect:function(count#1) yields: <function name="count" uri="http://www.w3.org/2005/xpath-functions" external="false"> <argument type="item()" occurrence="*"/> <return type="xs:integer"/> </function> The function… (:~ : This function simply returns the specified integer. : @param $number number to return : @return specified number :) declare %private function local:same($number as xs:integer) as xs:integer { $number }; …is represented by inspect:function(local:same#1) as… <function name="local:same" uri="http://www.w3.org/2005/xquery-local-functions" external="false"> <argument type="xs:integer" name="number">number to return</argument> <annotation name="private" uri="http://www.w3.org/2012/xquery"/> <description>This function simply returns the specified integer.</description> <return type="xs:integer">specified number</return> </function>

inspect:context

Signatures	inspect:context() as element(context)
Summary	Generates an element that describes all variables and functions in the current query context.
Examples	Evaluate all user-defined functions with zero arguments in the query context: inspect:context()/function ! function-lookup(QName(@uri, @name), 0) ! .() Return the names of all private functions in the current context: for $f in inspect:context()/function where $f/annotation/@name = 'private' return $f/@name/string()

inspect:module

Signatures	inspect:module($uri as xs:string) as element(module)
Summary	Retrieves the resource located at the specified $uri, parses it as XQuery module, and generates an element that describes the module's structure. A relative URI will be resolved against the static base URI of the query.
Examples	An example is shown below.

inspect:xqdoc

Signatures	inspect:xqdoc($uri as xs:string) as element(xqdoc:xqdoc)
Summary	Retrieves the resource located at the specified $uri, parses it as XQuery module, and generates an xqDoc element. A relative URI will be resolved against the static base URI of the query. xqDoc provides a simple vendor-neutral solution for generating documentation from XQuery modules. The documentation conventions have been inspired by the JavaDoc standard. Documentation comments begin with (:~ and end with :), and tags start with @. xqDoc comments can be specified for main and library modules and variable and function declarations. We have slightly extended the xqDoc conventions to do justice to more recent versions of XQuery (Schema: xqdoc-1.1.30052013.xsd): an <xqdoc:annotations/> node is added to each variable or function that uses annotations. The xqdoc:annotation child nodes may have additional xqdoc:literal elements with type attributes (xs:string, xs:integer, xs:decimal, xs:double) and values. a single <xqdoc:namespaces/> node is added to the root element, which summarizes all prefixes and namespace URIs used or declared in the module. name and type elements are added to variables.
Examples	An example is shown below.

Examples

This is the sample.xqm library module:

(:~ 
 : This module provides some sample functions to demonstrate
 : the features of the Inspection Module.
 :
 : @author   BaseX Team
 : @see      http://docs.basex.org/wiki/XQDoc_Module
 : @version  1.0
 :)
module namespace samples = 'http://basex.org/modules/samples';

(:~ This is a sample string. :)
declare variable $samples:test-string as xs:string := 'this is a string';

(:~
 : This function simply returns the specified integer.
 : @param   $number number to return
 : @return  specified number
 :)
declare %private function samples:same($number as xs:integer) as xs:integer {
  $number
};

If inspect:module('sample.xqm') is run, the following output will be generated:

<module prefix="samples" uri="http://basex.org/modules/samples">
  <description>This module provides some sample functions to demonstrate
the features of the Inspection Module.</description>
  <author>BaseX Team</author>
  <see>http://docs.basex.org/wiki/XQDoc_Module</see>
  <version>1.0</version>
  <variable name="samples:test-string" uri="http://basex.org/modules/samples" type="xs:string" external="false">
    <description>This is a sample string.</description>
  </variable>
  <function name="samples:same" uri="http://basex.org/modules/samples" external="false">
    <argument name="number" type="xs:integer">number to return</argument>
    <annotation name="private" uri="http://www.w3.org/2012/xquery"/>
    <description>This function simply returns the specified integer.</description>
    <return type="xs:integer">specified number</return>
  </function>
</module>

The output looks as follows if inspect:xqdoc('sample.xqm') is called:

<xqdoc:xqdoc xmlns:xqdoc="http://www.xqdoc.org/1.0">
  <xqdoc:control>
    <xqdoc:date>2013-06-01T16:59:33.654+02:00</xqdoc:date>
    <xqdoc:version>1.1</xqdoc:version>
  </xqdoc:control>
  <xqdoc:module type="library">
    <xqdoc:uri>http://basex.org/modules/samples</xqdoc:uri>
    <xqdoc:name>sample.xqm</xqdoc:name>
    <xqdoc:comment>
      <xqdoc:description>This module provides some sample functions to demonstrate
the features of the Inspection Module.</xqdoc:description>
      <xqdoc:author>BaseX Team</xqdoc:author>
      <xqdoc:see>http://docs.basex.org/wiki/XQDoc_Module</xqdoc:see>
      <xqdoc:version>1.0</xqdoc:version>
    </xqdoc:comment>
  </xqdoc:module>
  <xqdoc:namespaces>
    <xqdoc:namespace prefix="samples" uri="http://basex.org/modules/samples"/>
  </xqdoc:namespaces>
  <xqdoc:imports/>
  <xqdoc:variables>
    <xqdoc:variable>
      <xqdoc:name>samples:test-string</xqdoc:name>
      <xqdoc:comment>
        <xqdoc:description>This is a sample string.</xqdoc:description>
      </xqdoc:comment>
      <xqdoc:type>xs:string</xqdoc:type>
    </xqdoc:variable>
  </xqdoc:variables>
  <xqdoc:functions>
    <xqdoc:function arity="1">
      <xqdoc:comment>
        <xqdoc:description>This function simply returns the specified integer.</xqdoc:description>
        <xqdoc:param>$number number to return</xqdoc:param>
        <xqdoc:return>specified number</xqdoc:return>
      </xqdoc:comment>
      <xqdoc:name>samples:same</xqdoc:name>
      <xqdoc:annotations>
        <xqdoc:annotation name="private"/>
      </xqdoc:annotations>
      <xqdoc:signature>declare %private function samples:same($number as xs:integer) as xs:integer</xqdoc:signature>
      <xqdoc:parameters>
        <xqdoc:parameter>
          <xqdoc:name>number</xqdoc:name>
          <xqdoc:type>xs:integer</xqdoc:type>
        </xqdoc:parameter>
      </xqdoc:parameters>
      <xqdoc:return>
        <xqdoc:type>xs:integer</xqdoc:type>
      </xqdoc:return>
    </xqdoc:function>
  </xqdoc:functions>
</xqdoc:xqdoc>

Errors

Code	Description
unknown	The specified component does not exist.

Changelog

Version 9.3

• Added: inspect:type

Version 8.5

• Added: inspect:function-annotations, inspect:static-context
• Updated: external attribute added to variables and functions
• Updated: Relative URIs will always be resolved against the static base URI of the query

Version 7.9

• Updated: a query URI can now be specified with inspect:functions.

This module was introduced with Version 7.7.