[xsl] count the number of occurrences of an element which satisfy some condition

[Jayaranga Subasinghe <jayarangas@xxxxxxxxxxxxx>]

hello,
can any body give me a solution for the following problem?

I want to count the number of occurrences of an element<keyword>,
which 'xml:lang' attribute is 'en'.
the xml file is as follows:
        <KEYWORD xml:lang="en">Keyword 1</KEYWORD>
        <KEYWORD xml:lang="en">Keyword 2</KEYWORD>
        <KEYWORD xml:lang="no">Sokeord 1</KEYWORD>
        <KEYWORD xml:lang="no">Sokeord 2</KEYWORD>
        <KEYWORD xml:lang="no">Sokeord 3</KEYWORD>

thank you.

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