xml - What is best XSLT XPath performance in my scenario? -


i have question xslt xpath performance. if in following example.

which of following options has best performance:

<xsl:for-each select="//cd">

or

<xsl:for-each select="//catalog/cd">

xml data:

<?xml version="1.0" encoding="utf-8"?> <root>     <catalog>         <cd>             <title>empire burlesque</title>             <artist>bob dylan</artist>         </cd>         <cd>             <title>hide heart</title>             <artist>bonnie tyler</artist>         </cd>     </catalog>     <catalog>         <cd>             <title>greatest hits</title>             <artist>dolly parton</artist>         <cd>             <title>still got blues</title>             <artist>gary moore</artist>         </cd>     </catalog> </root>

xslt stylesheet:

<?xml version="1.0" encoding="utf-8"?> <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/xsl/transform"> <xsl:template match="/">   <html>   <body>     <h2>my cd collection</h2>     <table border="1">       <tr bgcolor="#9acd32">         <th>title</th>         <th>artist</th>       </tr>       <xsl:for-each select="//cd">       <tr>         <td><xsl:value-of select="title" /></td>         <td><xsl:value-of select="artist" /></td>       </tr>       </xsl:for-each>     </table>   </body>   </html> </xsl:template> </xsl:stylesheet>

wich has best performance?

(i have made smaller easier example, in real case have more complex data stracture)

the possible answer question "it depends on processor". rule should avoid using // un-necessarily, clever processor may able optimise simple //something absolute paths (e.g. using hash table nodes name) faster specified /root/catalog/cd.

you have profile specific processor on specific data.


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