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Re: RPN calculator
If you only allow binary multiply and sum then all you need is
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0"
>
<xsl:template match="multiply">
<xsl:variable name="x">
<xsl:apply-templates select="*[1]"/>
</xsl:variable>
<xsl:variable name="y">
<xsl:apply-templates select="*[2]"/>
</xsl:variable>
<xsl:value-of select="$x1*$x2"/>
</xsl:template>
<xsl:template match="sum">
<xsl:variable name="x">
<xsl:apply-templates select="*[1]"/>
</xsl:variable>
<xsl:variable name="y">
<xsl:apply-templates select="*[2]"/>
</xsl:variable>
<xsl:value-of select="$x1+$x2"/>
</xsl:template>
</xsl:stylesheet>
Although this isn't really like RPN, your input tree was a typical XML
tree structure, that relates to () and the point about RPN is that you
never need brackets or nested structure, you just have a flat stream:
(1+2)*3=6. in RPN would be 1 2 + 3 *
David
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