[b1a51ac1] | 1 | <refentry xmlns="http://docbook.org/ns/docbook"
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| 2 | xmlns:xlink="http://www.w3.org/1999/xlink"
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| 3 | xmlns:xi="http://www.w3.org/2001/XInclude"
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| 4 | xmlns:src="http://nwalsh.com/xmlns/litprog/fragment"
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| 5 | xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
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| 6 | version="5.0" xml:id="generate.consistent.ids">
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| 7 | <refmeta>
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| 8 | <refentrytitle>generate.consistent.ids</refentrytitle>
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| 9 | <refmiscinfo class="other" otherclass="datatype">boolean</refmiscinfo>
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| 10 | </refmeta>
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| 11 | <refnamediv>
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| 12 | <refname>generate.consistent.ids</refname>
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| 13 | <refpurpose>Generate consistent id values if document is unchanged</refpurpose>
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| 14 | </refnamediv>
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| 15 |
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| 16 | <refsynopsisdiv>
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| 17 | <src:fragment xml:id="generate.consistent.ids.frag">
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| 18 | <xsl:param name="generate.consistent.ids" select="0"/>
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| 19 | </src:fragment>
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| 20 | </refsynopsisdiv>
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| 21 |
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| 22 | <refsection><info><title>Description</title></info>
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| 23 |
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| 24 | <para>When the stylesheet assigns an id value to an output element,
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| 25 | the generate-id() function may be used. That function may not
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| 26 | produce consistent values between runs. Version control
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| 27 | systems may misidentify the changing id values as changes
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| 28 | to the document.</para>
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| 29 |
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| 30 | <para>If you set this parameter's value to 1, then the
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| 31 | template named <literal>object.id</literal> will replace
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| 32 | the use of the function generate-id() with
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| 33 | <literal><xsl:number level="multiple" count="*"/></literal>.
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| 34 | This counts preceding elements to generate a unique number for
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| 35 | the id value.</para>
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| 36 |
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| 37 | <caution>
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| 38 | <para>This param does not associate permanent unique id values
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| 39 | with particular elements.
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| 40 | The id values are consistent only as long as the document
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| 41 | structure does not change.
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| 42 | If the document structure changes, then the counting
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| 43 | of elements changes, and all id values after
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| 44 | the first such change may be different, even when there is
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| 45 | no change to the element itself or its output.
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| 46 | </para>
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| 47 | </caution>
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| 48 |
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| 49 | <para>The default value of this parameter is zero, so generate-id() is used
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| 50 | by default.</para>
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| 51 |
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| 52 | </refsection>
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| 53 | </refentry>
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