Slava Sedov wrote:
> need to effectively perform 2 sequential xslt transforms on some data 
> ((xm1+xsl1)+xsl2) and can`t find a way to do it without intermediate 
> transform intermediate xml to text - i use XslCompiledTransform with 
> XPathDocument, is anyone know good way to pass result data after first 
> xslt-transformation as source data for second xslt-transformation?

As XslCompiledTransform doesn't support XmlReader output, there is no 
such easy way. The only way that doesn't incur reparsing is transforming 
to XmlNodeWriter, which writes to XmlDocument. But then your next 
transformation will deal with XmlDocument, which is slower than 
XPathDocument.
We (XML MVPs) are working on this problem.

Another solution is to avoid double stylesheets and instead combine them 
into one (set mode for each template to distinguish them), then store 
first transformation in a variable, convert it to a nodeset and run 
second one.

> p.s. also i am interesting about best practice to this scenario - i get 
> xml1, then apply xslt1 to it and in result i get another xslt2 and then 
> perform tranformation of xml2 using xslt2. I don`t understand why i need 
> store intermediate results as strings instead of storing it as XPathDocument 
> or at least XMLDocument.
You don't have to. Transform to XmlWriter instead.

-- 
Oleg Tkachenko [XML MVP, MCAD]
http://www.xmllab.net
http://blog.tkachenko.com