I'm having some problems related to namespaces (I think).
Correct :)
The source file for the transformation:
<rdf:RDF xml:base="http://a.com/ontology";
xmlns="http://a.com/ontology#";
^^^^^^^^^^^^^
Your source xml has put all elements in this namespace.
[snip]
On the xsl I'm trying to enter the Products element but with
no sucess...
<xsl:stylesheet version="1.0" xmlns="http://a.com/ontology#";
^^^^^^^^^^
This puts the literal result elements of your stylesheet into a
namespace but won't help you with match patterns - you need to specify a
prefix here. For example xmlns:myprefix="http://a.com/ontology#";
Then use this prefix in your match pattern:
<xsl:template match="Products">
<xsl:element name="Product_class"/>
</xsl:template>
<xsl:template match="myprefix:Products">
^^^^^^^^^^^^
Cheers
andrew