[xsl] [XSLT Streaming] My code visits descendant nodes twice ... why don

Hi Folks,

According to the XSLT specification, when using streaming the XSLT code can 
only visit descendant nodes once. In the below code I copy all the child Book 
elements (visit #1) and then I count the number of child Book elements (visit 
#2). The code works without any errors. Why? It seems like I should have gotten 
an error since I visited the child Book elements more than once.

    <xsl:template match="BookCatalogue" mode="streaming">
        <BookStore>
            <xsl:copy-of select="Book"/>
            <NumberOfBooks><xsl:value-of select="count(Book)"/></NumberOfBooks>
        </BookStore>
    </xsl:template>

/Roger

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