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54 lines
1.9 KiB
XML
54 lines
1.9 KiB
XML
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<refentry xmlns="http://docbook.org/ns/docbook"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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xmlns:xi="http://www.w3.org/2001/XInclude"
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xmlns:src="http://nwalsh.com/xmlns/litprog/fragment"
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xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
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version="5.0" xml:id="generate.consistent.ids">
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<refmeta>
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<refentrytitle>generate.consistent.ids</refentrytitle>
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<refmiscinfo class="other" otherclass="datatype">boolean</refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>generate.consistent.ids</refname>
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<refpurpose>Generate consistent id values if document is unchanged</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<src:fragment xml:id="generate.consistent.ids.frag">
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<xsl:param name="generate.consistent.ids" select="0"/>
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</src:fragment>
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</refsynopsisdiv>
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<refsection><info><title>Description</title></info>
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<para>When the stylesheet assigns an id value to an output element,
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the generate-id() function may be used. That function may not
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produce consistent values between runs. Version control
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systems may misidentify the changing id values as changes
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to the document.</para>
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<para>If you set this parameter's value to 1, then the
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template named <literal>object.id</literal> will replace
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the use of the function generate-id() with
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<literal><xsl:number level="multiple" count="*"/></literal>.
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This counts preceding elements to generate a unique number for
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the id value.</para>
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<caution>
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<para>This param does not associate permanent unique id values
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with particular elements.
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The id values are consistent only as long as the document
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structure does not change.
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If the document structure changes, then the counting
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of elements changes, and all id values after
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the first such change may be different, even when there is
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no change to the element itself or its output.
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</para>
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</caution>
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<para>The default value of this parameter is zero, so generate-id() is used
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by default.</para>
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</refsection>
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</refentry>
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