Questions about date:parse-date(), date:format-date() and date:date-format

险峰 张 <[email protected]>
Newsgroups gmane.text.xml.xslt.extensions
Message-ID <[email protected]>
Hi,
 
I am new to EXSLT. Now I am planning to implement the "dates and times" in EXSLT. 
When I read the specifications for date:format-date() and date:parse-date(), I am a little confused. 
They look somewhat redundant to me. If I implement the date:format-date(), it seems to cover what date:parse-date() can do.
For example: date:format-date("2005-06-03", "yyyy") is the same as date:parse-date("2005-06-03", "yyyy"). Am I right? 
Currently, is there any xslt processor to support date:parse-date()? I saw the reference implementation by Chris Bayes (http://www.exslt.org/date/functions/parse-date/date.msxsl.xsl).
However, the implementation is different with specification. In specification it has 2 arguments. In Bayes's implementation, there are 3 arguments. What did cause the difference?
 
Another question is about date:date-format element. Is there any sample or any reference implement for it? It's hard to understand it for me only from specification on exslt.org. -Thanks
 
 
Allan
 
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