342 lines
13 KiB
Plaintext
342 lines
13 KiB
Plaintext
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<html>
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<head>
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<title>Associating Style Sheets with XML documents</title>
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<link rel="stylesheet" type="text/css" href="http://www.w3.org/StyleSheets/TR/W3C-REC">
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<style type="text/css">code { font-family: monospace }</style>
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</head>
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<body>
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<div class="head">
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<a href="http://www.w3.org/"><img src="http://www.w3.org/Icons/WWW/w3c_home" alt="W3C" height="48" width="72"></a>
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<h1>Associating Style Sheets with XML documents<br>Version 1.0</h1>
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<h2>W3C Recommendation 29 June 1999</h2>
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<dl>
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<dt>This version:</dt>
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<dd>
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<a href="http://www.w3.org/1999/06/REC-xml-stylesheet-19990629">http://www.w3.org/1999/06/REC-xml-stylesheet-19990629</a>
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<br>
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</dd>
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<dt>Latest version:</dt>
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<dd>
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<a href="http://www.w3.org/TR/xml-stylesheet">http://www.w3.org/TR/xml-stylesheet</a>
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<br>
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</dd>
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<dt>Previous version:</dt>
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<dd>
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<a href="http://www.w3.org/TR/1999/xml-stylesheet-19990428">http://www.w3.org/TR/1999/xml-stylesheet-19990428</a>
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<br>
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</dd>
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<dt>Editor:</dt>
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<dd>
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James Clark
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<a href="mailto:jjc@jclark.com"><jjc@jclark.com></a>
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<br>
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</dd>
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</dl>
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<p class="copyright">
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<a href="http://www.w3.org/Consortium/Legal/ipr-notice.html#Copyright">
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Copyright</a> © 1999 <a href="http://www.w3.org">W3C</a>
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(<a href="http://www.lcs.mit.edu">MIT</a>,
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<a href="http://www.inria.fr/">INRIA</a>,
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<a href="http://www.keio.ac.jp/">Keio</a> ), All Rights Reserved. W3C
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<a href="http://www.w3.org/Consortium/Legal/ipr-notice.html#Legal Disclaimer">liability,</a><a href="http://www.w3.org/Consortium/Legal/ipr-notice.html#W3C Trademarks">trademark</a>,
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<a href="http://www.w3.org/Consortium/Legal/copyright-documents.html">document use </a>and
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<a href="http://www.w3.org/Consortium/Legal/copyright-software.html">software licensing </a>rules apply.
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</p>
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<hr title="Separator for header">
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</div>
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<h2>
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<a name="abstract">Abstract</a>
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</h2>
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<p>This document allows a style sheet to be associated with an XML
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document by including one or more processing instructions with a
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target of <code>xml-stylesheet</code> in the document's prolog.</p>
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<h2>
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<a name="status">Status of this document</a>
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</h2>
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<p>This document has been reviewed by W3C Members and other interested
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parties and has been endorsed by the Director as a W3C <a href="http://www.w3.org/Consortium/Process/#RecsW3C">Recommendation</a>. It
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is a stable document and may be used as reference material or cited as
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a normative reference from other documents. W3C's role in making the
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Recommendation is to draw attention to the specification and to
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promote its widespread deployment. This enhances the functionality and
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interoperability of the Web.</p>
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<p>The list of known errors in this specifications is available at
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<a href="http://www.w3.org/1999/06/REC-xml-stylesheet-19990629/errata">http://www.w3.org/TR/1999/xml-stylesheet-19990629/errata</a>.</p>
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<p>Comments on this specification may be sent to <<a href="mailto:www-xml-stylesheet-comments@w3.org">www-xml-stylesheet-comments@w3.org</a>>. The archive of public
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comments is available at <a href="http://www.w3.org/Archives/Public/www-xml-stylesheet-comments">http://w3.org/Archives/Public/www-xml-stylesheet-comments</a>.</p>
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<p>A list of current W3C Recommendations and other technical documents
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can be found at <a href="http://www.w3.org/TR">http://www.w3.org/TR</a>.</p>
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<p>The Working Group expects additional mechanisms for linking style
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sheets to XML document to be defined in a future specification.</p>
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<p>The use of XML processing instructions in this specification should
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not be taken as a precedent. The W3C does not anticipate recommending
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the use of processing instructions in any future specification. The
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<a href="#rationale">Rationale</a> explains why they were used in
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this specification.</p>
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<p>This document was produced as part of the <a href="http://www.w3.org/XML/Activity">W3C XML Activity</a>.</p>
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<h2>
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<a name="contents">Table of contents</a>
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</h2>1 <a href="#The xml-stylesheet processing instruction">The xml-stylesheet processing instruction</a>
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<br>
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<h3>Appendices</h3>A <a href="#References">References</a>
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<br>B <a href="#rationale">Rationale</a>
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<br>
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<hr>
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<h2>
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<a name="The xml-stylesheet processing instruction"></a>1 The <code>xml-stylesheet</code> processing instruction</h2>
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<p>Style Sheets can be associated with an XML<a href="#XML">[XML10]</a>
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document by using a processing instruction whose target is
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<code>xml-stylesheet</code>. This processing instruction follows the
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behaviour of the HTML 4.0 <code><LINK
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REL="stylesheet"></code><a href="#HTML">[HTML40]</a>.</p>
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<p>The <code>xml-stylesheet</code> processing instruction is parsed in
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the same way as a start-tag, with the exception that entities other
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than predefined entities must not be referenced.</p>
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<p>The following grammar is given using the same notation as the
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grammar in the XML Recommendation<a href="#XML">[XML10]</a>. Symbols in the
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grammar that are not defined here are defined in the XML
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Recommendation.</p>
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<h5>xml-stylesheet processing instruction</h5>
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<table class="scrap">
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<tbody>
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<tr valign="baseline">
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<td>
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<a name="NT-StyleSheetPI"></a>[1] </td>
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<td>StyleSheetPI</td>
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<td> ::= </td>
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<td>'<?xml-stylesheet' (<a href="http://www.w3.org/TR/REC-xml#NT-S">S</a> <a href="#NT-PseudoAtt">PseudoAtt</a>)* <a href="http://www.w3.org/TR/REC-xml#NT-S">S</a>? '?>'</td>
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<td>
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</td>
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</tr>
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<tr valign="baseline">
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<td>
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<a name="NT-PseudoAtt"></a>[2] </td>
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<td>PseudoAtt</td>
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<td> ::= </td>
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<td>
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<a href="http://www.w3.org/TR/REC-xml#NT-Name">Name</a> <a href="http://www.w3.org/TR/REC-xml#NT-S">S</a>? '=' <a href="http://www.w3.org/TR/REC-xml#NT-S">S</a>? <a href="#NT-PseudoAttValue">PseudoAttValue</a>
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</td>
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<td>
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</td>
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</tr>
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<tr valign="baseline">
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<td>
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<a name="NT-PseudoAttValue"></a>[3] </td>
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<td>PseudoAttValue</td>
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<td> ::= </td>
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<td>('"' ([^"<&] | <a href="http://www.w3.org/TR/REC-xml#NT-CharRef">CharRef</a> | <a href="#NT-PredefEntityRef">PredefEntityRef</a>)* '"'</td>
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<td>
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</td>
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</tr>
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<tr valign="baseline">
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<td>
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</td>
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<td>
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</td>
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<td>
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</td>
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<td>| "'" ([^'<&] | <a href="http://www.w3.org/TR/REC-xml#NT-CharRef">CharRef</a> | <a href="#NT-PredefEntityRef">PredefEntityRef</a>)* "'")</td>
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<td>
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</td>
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</tr>
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<tr valign="baseline">
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<td>
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</td>
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<td>
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</td>
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<td>
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</td>
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<td>- (<a href="http://www.w3.org/TR/REC-xml#NT-Char">Char</a>* '?>' <a href="http://www.w3.org/TR/REC-xml#NT-Char">Char</a>*)</td>
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<td>
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</td>
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</tr>
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<tr valign="baseline">
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<td>
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<a name="NT-PredefEntityRef"></a>[4] </td>
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<td>PredefEntityRef</td>
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<td> ::= </td>
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<td>'&amp;' | '&lt;' | '&gt;' | '&quot;' | '&apos;'</td>
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<td>
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</td>
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</tr>
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</tbody>
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</table>
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<p>In <a href="#NT-PseudoAttValue">PseudoAttValue</a>, a <a href="http://www.w3.org/TR/REC-xml#NT-CharRef">CharRef</a> or a <a href="#NT-PredefEntityRef">PredefEntityRef</a> is interpreted in the
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same manner as in a normal XML attribute value. The actual value of
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the pseudo-attribute is the value after each reference is replaced by
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the character it references. This replacement is not performed
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automatically by an XML processor.</p>
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<p>The <code>xml-stylesheet</code> processing instruction is allowed
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only in the prolog of an XML document. The syntax of XML constrains
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where processing instructions are allowed in the prolog; the
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<code>xml-stylesheet</code> processing instruction is allowed anywhere
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in the prolog that meets these constraints.</p>
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<blockquote>
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<b>NOTE: </b>If the <code>xml-stylesheet</code> processing instruction
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occurs in the external DTD subset or in a parameter entity, it is
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possible that it may not be processed by a non-validating XML
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processor (see <a href="#XML">[XML10]</a>).</blockquote>
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<p>The following pseudo attributes are defined</p>
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<pre>href CDATA #REQUIRED
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type CDATA #REQUIRED
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title CDATA #IMPLIED
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media CDATA #IMPLIED
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charset CDATA #IMPLIED
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alternate (yes|no) "no"</pre>
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<p>The semantics of the pseudo-attributes are exactly as with
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<code><LINK REL="stylesheet"></code> in HTML 4.0, with the
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exception of the <code>alternate</code> pseudo-attribute. If
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<code>alternate="yes"</code> is specified, then the processing
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instruction has the semantics of <code><LINK REL="alternate
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stylesheet"></code> instead of <code><LINK
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REL="stylesheet"></code>.</p>
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<blockquote>
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<b>NOTE: </b>Since the value of the <code>href</code> attribute is a URI
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reference, it may be a relative URI and it may contain a fragment
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identifier. In particular the URI reference may contain only a
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fragment identifier. Such a URI reference is a reference to a part of
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the document containing the <code>xml-stylesheet</code> processing
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instruction (see <a href="#RFC2396">[RFC2396]</a>). The consequence is that the
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<code>xml-stylesheet</code> processing instruction allows style sheets
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to be embedded in the same document as the <code>xml-stylesheet</code>
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processing instruction.</blockquote>
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<p>In some cases, style sheets may be linked with an XML document by
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means external to the document. For example, earlier versions of HTTP
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<a href="#RFC2068">[RFC2068]</a> (section 19.6.2.4) allowed style sheets to be
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associated with XML documents by means of the <code>Link</code>
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header. Any links to style sheets that are specified externally to the
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document are considered to occur before the links specified by the
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<code>xml-stylesheet</code> processing instructions. This is the same
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as in HTML 4.0 (see <a href="http://www.w3.org/TR/REC-html40/present/styles.html#h-14.6">section
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14.6</a>).</p>
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<p>Here are some examples from HTML 4.0 with the corresponding
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processing instruction:</p>
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<pre><LINK href="mystyle.css" rel="style sheet" type="text/css">
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<?xml-stylesheet href="mystyle.css" type="text/css"?>
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<LINK href="mystyle.css" title="Compact" rel="stylesheet"
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type="text/css">
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<?xml-stylesheet href="mystyle.css" title="Compact" type="text/css"?>
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<LINK href="mystyle.css" title="Medium" rel="alternate stylesheet"
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type="text/css">
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<?xml-stylesheet alternate="yes" href="mystyle.css" title="Medium"
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type="text/css"?></pre>
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<p>Multiple <code>xml-stylesheet</code> processing instructions are
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also allowed with exactly the same semantics as with <code>LINK
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REL="stylesheet"</code>. For example,</p>
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<pre><LINK rel="alternate stylesheet" title="compact" href="small-base.css"
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type="text/css">
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<LINK rel="alternate stylesheet" title="compact" href="small-extras.css"
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type="text/css">
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<LINK rel="alternate stylesheet" title="big print" href="bigprint.css"
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type="text/css">
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<LINK rel="stylesheet" href="common.css" type="text/css"></pre>
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<p>would be equivalent to:</p>
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<pre><?xml-stylesheet alternate="yes" title="compact" href="small-base.css"
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type="text/css"?>
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<?xml-stylesheet alternate="yes" title="compact" href="small-extras.css"
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type="text/css"?>
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<?xml-stylesheet alternate="yes" title="big print" href="bigprint.css"
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type="text/css"?>
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<?xml-stylesheet href="common.css" type="text/css"?></pre>
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<hr title="Separator from footer">
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<h2>
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<a name="References"></a>A References</h2>
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<dl>
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<dt>
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<a name="HTML">HTML40</a>
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</dt>
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<dd>World Wide Web
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Consortium. <i>HTML 4.0 Specification.</i> W3C Recommendation. See
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<a href="http://www.w3.org/TR/REC-html40">http://www.w3.org/TR/REC-html40</a>
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</dd>
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<dt>
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<a name="RFC2068">RFC2068</a>
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</dt>
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<dd>R. Fielding, J. Gettys, J. Mogul,
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H. Frystyk Nielsen, and T. Berners-Lee. <i>Hypertext Transfer
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Protocol -- HTTP/1.1.</i>. IETF RFC 2068. See <a href="http://www.ietf.org/rfc/rfc2068.txt">http://www.ietf.org/rfc/rfc2068.txt</a>.</dd>
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<dt>
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<a name="RFC2396">RFC2396</a>
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</dt>
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<dd>T. Berners-Lee, R. Fielding, and
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L. Masinter. <i>Uniform Resource Identifiers (URI): Generic
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Syntax</i>. IETF RFC 2396. See <a href="http://www.ietf.org/rfc/rfc2396.txt">http://www.ietf.org/rfc/rfc2396.txt</a>.</dd>
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<dt>
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<a name="XML">XML10</a>
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</dt>
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<dd>World Wide Web Consortium. <i>Extensible
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Markup Language (XML) 1.0.</i> W3C Recommendation. See <a href="http://www.w3.org/TR/1998/REC-xml-19980210">http://www.w3.org/TR/1998/REC-xml-19980210</a>
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</dd>
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</dl>
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<h2>
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<a name="rationale"></a>B Rationale</h2>
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<p>There was an urgent requirement for a specification for style sheet
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linking that could be completed in time for the next release from
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major browser vendors. Only by choosing a simple mechanism closely
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based on a proven existing mechanism could the specification be
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completed in time to meet this requirement.</p>
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<p>Use of a processing instruction avoids polluting the main document
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structure with application specific processing information.</p>
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<p>The mechanism chosen for this version of the specification is not a
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constraint on the additional mechanisms planned for future versions.
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There is no expectation that these will use processing instructions;
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indeed they may not include the linking information in the source
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document.</p>
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</body>
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</html>
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