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Expressions

XPath expressions can appear either as the contents of an XML element or as the contents of an expr (expression) statement. In either case, the value is translated to an <xsl:text> or <xsl:value-of> element.

You encode strings using quotation marks (single or double). The concatenation operator is underscore (_), as in PERL 6.

In this example, the contents of the <three> and <four> elements are identical, and the content of the <five> element differs only in the use of the XPath concat() function.



<top> {
<one>"test";
<two>"The answer is " _ results/answer _ ".";
<three>results/count _ " attempts made by " _ results/user;


<four> {
expr results/count _ " attempts made by " _ results/user;
}




<five> {
expr results/count;
expr " attempts made by ";
expr results/user;
}


<six>results/message;
}

The equivalent XSLT:



<top>
    <one><xsl:text>test</xsl:text></one>
    <two><xsl:value-of select='concat("The answer is ", 
                              results/answer, ".")'/></two>
    <three><xsl:value-of select='concat(results/count,
                              " attempts made by ", , results/user)'/></three>
    <four><xsl:value-of select='concat(results/count,
                              " attempts made by ", , results/user)'/></four>
    <five>
        <xsl:value-of select="results/count"/>
        <xsl:text> attempts made by </xsl:text>
        <xsl:value-of select="results/user"/>
    </five>
    <six><xsl:value-of select='results/message'/></six>
</top>

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