[xsl] Context node versus current streaming position

Hi Folks,

I learned something neat from Michael Kay.

I learned that context node and current streaming position are not always the 
same.

Suppose the XSLT processor is streaming through an input document and has 
arrived at element N. The <N> element  is the current streaming position.

Now suppose the XSLT program instructs the XSLT processor: from your current 
streaming position climb the XML tree and return the name of each ancestor 
element:

        <xsl:for-each select="ancestor::*">
            <xsl:value-of select="name(.)" />
        </xsl:for-each>

The context position changes with each iteration of the for-each statement. But 
the current streaming position remains the same.

This is a key concept!

/Roger

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