57 lines
2.4 KiB
XML
Vendored
57 lines
2.4 KiB
XML
Vendored
<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="l10n.lang.value.rfc.compliant">
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<refmeta>
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<refentrytitle>l10n.lang.value.rfc.compliant</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>l10n.lang.value.rfc.compliant</refname>
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<refpurpose>Make value of lang attribute RFC compliant?</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<src:fragment xml:id="l10n.lang.value.rfc.compliant.frag">
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<xsl:param name="l10n.lang.value.rfc.compliant" select="1"/>
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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>If non-zero, ensure that the values for all <tag class="attribute">lang</tag> attributes in HTML output are RFC
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compliant<footnote><para>Section 8.1.1, <link xlink:href="http://www.w3.org/TR/REC-html40/struct/dirlang.html#h-8.1.1">Language Codes</link>, in the HTML 4.0 Recommendation states that:
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<blockquote><para>[RFC1766] defines and explains the language codes
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that must be used in HTML documents.</para>
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<para>Briefly, language codes consist of a primary code and a possibly
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empty series of subcodes:
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<literallayout class="monospaced">language-code = primary-code ( "-" subcode )*</literallayout>
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</para>
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<para>And in RFC 1766, <link xlink:href="http://www.ietf.org/rfc/rfc1766.txt">Tags for the Identification
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of Languages</link>, the EBNF for "language tag" is given as:
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<literallayout class="monospaced">Language-Tag = Primary-tag *( "-" Subtag )
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Primary-tag = 1*8ALPHA
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Subtag = 1*8ALPHA</literallayout>
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</para>
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</blockquote>
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</para></footnote>.
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by taking any underscore characters in any <tag class="attribute">lang</tag> values found in source documents, and
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replacing them with hyphen characters in output HTML files. For
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example, <literal>zh_CN</literal> in a source document becomes
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<literal>zh-CN</literal> in the HTML output form that source.
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<note>
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<para>This parameter does not cause any case change in <tag class="attribute">lang</tag> values, because RFC 1766
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explicitly states that all "language tags" (as it calls them) "are
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to be treated as case insensitive".</para>
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</note>
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</para>
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</refsection>
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</refentry>
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