Another XSLT code snippet for anyone using RNG out there. Here's a
snippet to convert an instance document path into an XPath-like string
that will locate the correct segment of a Relax NG (RNG) grammar.
The input param "fragment" might be something like
"/resume/header/contact and then output will be something like
"//*[@name='resume']//*[@name='header']//*[@name='contact']/*". You
would then call dyn:evaluate() in EXSLT (or whatever equivalent you
have) on the resulting string to turn it into a genuine XPath.
Comments welcome as always.
<!-- Converts an instance path to an RNG path -->
<xsl:template name="inst2rngPath">
<xsl:param name="fragment"/>
<xsl:choose>
<xsl:when test="starts-with($fragment, '/')"> <!-- strip
beginning / -->
<xsl:call-template name="inst2rngPath">
<xsl:with-param name="fragment"
select="substring-after($fragment, '/')"/>
</xsl:call-template>
</xsl:when><xsl:otherwise>
<xsl:text>//*[@name='</xsl:text>
<xsl:choose><xsl:when test="substring-before($fragment, '/')">
<xsl:value-of select="substring-before($fragment, '/')"/>
</xsl:when><xsl:otherwise>
<xsl:value-of select="$fragment"/>
</xsl:otherwise></xsl:choose>
<xsl:text>']</xsl:text>
<xsl:choose>
<xsl:when test="contains($fragment, '/')"> <!-- recursive
step -->
<xsl:call-template name="inst2rngPath">
<xsl:with-param name="fragment"
select="substring-after($fragment, '/')"/>
</xsl:call-template>
</xsl:when><xsl:otherwise> <!-- default step -->
<xsl:text>/*</xsl:text>
</xsl:otherwise>
</xsl:choose>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
simon
--
www.simonwoodside.com -- 99% Devil, 1% Angel
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