RE: Re:

But you can get some information about the document and its content if you
look inside the stylesheet and to the result.

If in this case we will have for instance the stylesheet as

<?xml version="1.0" encoding="UTF-8" ?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0">
    <xsl:template match="/">
        [<xsl:value-of select="test/a"/>]
        [<xsl:value-of select="test/b"/>]
    </xsl:template>
</xsl:stylesheet>

and the output:

[a]
[b]

Then you can infere that the initial document has test as root element and
at least two children a and b with content "a" and "b" respectivelly.

Regards,
Ragulf :)