| 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="l10n.lang.value.rfc.compliant">
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| 7 | <refmeta>
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| 8 | <refentrytitle>l10n.lang.value.rfc.compliant</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>l10n.lang.value.rfc.compliant</refname>
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| 13 | <refpurpose>Make value of lang attribute RFC compliant?</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="l10n.lang.value.rfc.compliant.frag">
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| 18 | <xsl:param name="l10n.lang.value.rfc.compliant" select="1"/>
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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>If non-zero, ensure that the values for all <tag class="attribute">lang</tag> attributes in HTML output are RFC
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| 25 | 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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| 26 |
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| 27 | <blockquote><para>[RFC1766] defines and explains the language codes
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| 28 | that must be used in HTML documents.</para>
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| 29 | <para>Briefly, language codes consist of a primary code and a possibly
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| 30 | empty series of subcodes:
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| 31 |
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| 32 | <literallayout class="monospaced">language-code = primary-code ( "-" subcode )*</literallayout>
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| 33 | </para>
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| 34 | <para>And in RFC 1766, <link xlink:href="http://www.ietf.org/rfc/rfc1766.txt">Tags for the Identification
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| 35 | of Languages</link>, the EBNF for "language tag" is given as:
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| 36 |
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| 37 | <literallayout class="monospaced">Language-Tag = Primary-tag *( "-" Subtag )
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| 38 | Primary-tag = 1*8ALPHA
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| 39 | Subtag = 1*8ALPHA</literallayout>
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| 40 | </para>
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| 41 | </blockquote>
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| 42 | </para></footnote>.
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| 43 |
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| 44 | by taking any underscore characters in any <tag class="attribute">lang</tag> values found in source documents, and
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| 45 | replacing them with hyphen characters in output HTML files. For
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| 46 | example, <literal>zh_CN</literal> in a source document becomes
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| 47 | <literal>zh-CN</literal> in the HTML output form that source.
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| 48 |
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| 49 | <note>
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| 50 | <para>This parameter does not cause any case change in <tag class="attribute">lang</tag> values, because RFC 1766
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| 51 | explicitly states that all "language tags" (as it calls them) "are
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| 52 | to be treated as case insensitive".</para>
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| 53 | </note>
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| 54 | </para>
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| 55 |
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| 56 | </refsection>
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| 57 | </refentry>
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