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<HTML>
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<TITLE>Canonical XML</TITLE>
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<BODY>
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<H1>Canonical XML</H1>
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<P>
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This document defines a subset of XML called canonical XML.
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The intended use of canonical XML is in testing XML processors,
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as a representation of the result of parsing an XML document.
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<P>
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Every well-formed XML document has a unique structurally equivalent
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canonical XML document. Two structurally equivalent XML
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documents have a byte-for-byte identical canonical XML document.
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Canonicalizing an XML document requires only information that an XML
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processor is required to make available to an application.
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<P>
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A canonical XML document conforms to the following grammar:
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<PRE>
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CanonXML ::= Pi* element Pi*
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element ::= Stag (Datachar | Pi | element)* Etag
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Stag ::= '<' Name Atts '>'
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Etag ::= '</' Name '>'
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Pi ::= '<?' Name ' ' (((Char - S) Char*)? - (Char* '?>' Char*)) '?>'
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Atts ::= (' ' Name '=' '"' Datachar* '"')*
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Datachar ::= '&amp;' | '&lt;' | '&gt;' | '&quot;'
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| '&#9;'| '&#10;'| '&#13;'
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| (Char - ('&' | '<' | '>' | '"' | #x9 | #xA | #xD))
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Name ::= (see XML spec)
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Char ::= (see XML spec)
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S ::= (see XML spec)
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</PRE>
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<P>
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Attributes are in lexicographical order (in Unicode bit order).
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<P>
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A canonical XML document is encoded in UTF-8.
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<P>
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Ignorable white space is considered significant and is treated equivalently
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to data.
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<P>
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<ADDRESS>
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<A HREF="mailto:jjc@jclark.com">James Clark</A>
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</ADDRESS>
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</BODY>
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</HTML> |