Hi Bob,
> Canonical is almost trivial once full xpath (with document-ordering) is
> available. And I'm working on that aspect now...
>
> -bob
I reviewed the Canonical Spec as I read your comment and agree with you. It
seems to me that most of Canonical Algorithm is part of XPath. Do you
implement
something like XML Information Set Mapping. Could you tell me what is NOT
provided by such a XPath Impl? Following sipplet contains the chances that
are
necessary to transform a xml document into cannocial form:
<sipplet>
- The document is encoded in UTF-8 (i think that is dom4j standard)
- Line breaks normalized to #xA on input, before parsing
- Attribute values are normalized, as if by a validating processor
- Character and parsed entity references are replaced
- CDATA sections are replaced with their character content
- The XML declaration and document type declaration (DTD) are removedEmpty
elements are converted to start-end tag pairs
- Whitespace outside of the document element and within start and end tags
is normalizedAll whitespace in character content is retained (excluding
characters
removed during line feed normalization)
Attribute value delimiters are set to quotation marks (double quotes)Special
characters in attribute values and character content are
replaced by character references
-Superfluous namespace declarations are removed from each elementDefault
attributes are added to each element
-Lexicographic order is imposed on the namespace declarations and
attributes of each element
</sipplet>
I guess some of that aspects are not covered by an XPath Implementation?
What
did you think?
How fast would it be? Rember that Java MAC Functions are not so fast as
should
;-) (we will use SHA-1 ).
As James emphasised serveral times XPath is one of the powerfull features of
dom4j and I like it very much.
Regards
Toby
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