library
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library

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Declaration
Related GitHub issue(s)
Sample usage
Commentary

Element context(s)

Clause 5.4.8 (library element)

The library element is an allowed root element containing external declarations, including abstract rules [...] and patterns [...].The contents of this element can be included in a schema by using extends.

Declaration

element library {
        attribute id { xsd:ID }?,
        rich,
        (foreign
         & (inclusion | extends)*
         & (title?, p*, param*, let*, abstract-rules*, (rule-set|pattern)*, p*, diagnostics?, properties?))
    }

Related GitHub issue(s)

A library system for abstract patterns and abstract rule-sets

Sample usage

Example 13. library element

Given this schema:

<sch:schema xmlns:sch="http://purl.oclc.org/dsdl/schematron" queryBinding="xquery">
  <sch:extends href='library.sch'/>
  <sch:pattern>
    <sch:rule context="/">
      <sch:assert test="true()">Always true</sch:assert>
    </sch:rule>
  </sch:pattern>
</sch:schema>

and the library imported via extends from library.sch (see highlight above):

<library xmlns="http://purl.oclc.org/dsdl/schematron" queryBinding="xquery">
    <pattern id='blort'>
        <rule context="blort">
            <assert test="@wibble">Element <name/> must have attribute 'wibble'</assert>
        </rule>
    </pattern>    
    <pattern id='wibble'>
        <rule context="wibble">
            <assert test=". = $some-global">Element <name/> must have value '<value-of select="$some-global"/>'</assert>
        </rule>
    </pattern>    
</library>

the contents of the library will be included in place of the extends element, to produce the resulting schema:

<sch:schema xmlns:sch="http://purl.oclc.org/dsdl/schematron" queryBinding="xquery">
  <pattern xmlns="http://purl.oclc.org/dsdl/schematron" id="blort">
        <rule context="blort">
            <assert test="@wibble">Element <name/> must have attribute 'wibble'</assert>
        </rule>
    </pattern>
  <pattern xmlns="http://purl.oclc.org/dsdl/schematron" id="wibble">
        <rule context="wibble">
            <assert test=". = $some-global">Element <name/> must have value '<value-of select="$some-global"/>'</assert>
        </rule>
    </pattern>
  <sch:pattern>
    <sch:rule context="/">
      <sch:assert test="true()">Always true</sch:assert>
    </sch:rule>
  </sch:pattern>
</sch:schema>

Commentary

This element is a convenience for building modular schemas, featuring a pared-down version of element schema's content model.

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