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74 lines
2.6 KiB
74 lines
2.6 KiB
<refentry id="prefer.internal.olink">
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<refmeta>
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<refentrytitle>prefer.internal.olink</refentrytitle>
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<refmiscinfo role="type">boolean</refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>prefer.internal.olink</refname>
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<refpurpose>Prefer a local olink reference to an external reference</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<src:fragment id='prefer.internal.olink.frag'>
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<xsl:param name="prefer.internal.olink" select="0"/>
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</src:fragment>
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</refsynopsisdiv>
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<refsect1><title>Description</title>
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<para>If you are re-using XML content modules in multiple documents,
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you may want to redirect some of your olinks. This parameter
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permits you to redirect an olink to the current document.
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</para>
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<para>For example: you are writing documentation for a product,
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which includes 3 manuals: a little installation
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booklet (booklet.xml), a user
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guide (user.xml), and a reference manual (reference.xml).
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All 3 documents begin with the same introduction section (intro.xml) that
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contains a reference to the customization section (custom.xml) which is
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included in both user.xml and reference.xml documents.
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</para>
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<para>How do you write the link to custom.xml in intro.xml
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so that it is interpreted correctly in all 3 documents?</para>
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<itemizedlist>
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<listitem><para>If you use xref, it will fail in user.xml.</para>
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</listitem>
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<listitem><para>If you use olink (pointing to reference.xml),
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the reference in user.xml
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will point to the customization section of the reference manual, while it is
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actually available in user.xml.</para>
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</listitem>
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</itemizedlist>
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<para>If you set the <parameter>prefer.internal.olink</parameter>
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parameter to a non-zero value, then the processor will
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first look in the olink database
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for the olink's <sgmltag>targetptr</sgmltag> attribute value
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in document matching the <parameter>current.docid</parameter>
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parameter value. If it isn't found there, then
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it tries the document in the database
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with the <sgmltag>targetdoc</sgmltag>
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value that matches the olink's <sgmltag>targetdoc</sgmltag>
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attribute.
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</para>
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<para>This feature permits an olink reference to resolve to
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the current document if there is an element
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with an id matching the olink's <sgmltag>targetptr</sgmltag>
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value. The current document's olink data must be
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included in the target database for this to work.</para>
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<caution>
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<para>There is a potential for incorrect links if
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the same <sgmltag>id</sgmltag> attribute value is used for different
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content in different documents.
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Some of your olinks may be redirected to the current document
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when they shouldn't be. It is not possible to control
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individual olink instances.</para>
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</caution>
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</refsect1>
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</refentry>
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