It sounds as if you want a result that is ASCII, that is of modest length,
and that has a high probability of being unique without offering a
guarantee.
You could do the equivalent of
string(sum(for $c at $p in string-to-codepoints(document-uri(/)) return
$c*$p))
(the equivalent in XSLT is a bit more longwinded because of the lack of "at
$p")
Michael Kay
http://www.saxonica.com/
-----Original Message-----
From: Deborah Pickett [mailto:debbiep-list-xsl(_at_)futzle(_dot_)com]
Sent: 14 December 2007 07:36
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: [xsl] String hashing code
A challenge to the XSLT demigods...
I am processing a number of separate XML documents using an
Ant <xslt> task, pulling out the MathML that is embedded
inside them into their own XML files using
xsl:result-document (where I render them using Batik).
I want to make sure that the result document names don't
clash, but because they are across several source files,
generate-id() isn't going to suffice. There are thousands of
source files, all with English-sounding names spread across
many directories.
I was thinking of hashing document-uri(/) to produce a
probably-unique string that I can then append generate-id(.)
to. I rejected
encode-for-uri() as producing strings that are too long, and
for not anonymizing the document uri enough. All the hashing
algorithms I know (MD5, for instance) happen to be heavy on
bitwise operations, and I feel dirty doing bitwise operations
with arithmetic.
I prefer not to escape to non-XSLT, because I am providing
this as part of a library that needs to run on almost any
XSLT 2.0 platform.
Any clever ideas?
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