CODEWITHSUNDEEP
xsltxpathxslt-1.0xslt-2.0
it'sme
it'sme

Reputation: 551

Better performance with XPath Axes Vs Location Path Expression in XSLT/Xpath

which one give better performance when we handling XML with XSLT

XPath Axes (i.e. parent,attribute,child.....) or Location Path Expression (i.e. ./.., ./@attribute ,./childnode,... )

Please help me which one is give more performance and safe to use..

Upvotes: 1

Views: 519

Answers (3)

Dimitre Novatchev
Dimitre Novatchev

Reputation: 243549

Borodin's answer is almost correct.

While the given expressions have the same efficiency, their are some subtle differences in the syntax rules of using them.

For example:

.[someCondition]

..[someCondition]

are invalid XPath 1.0 expressions and any compliant XSLT 1.0 processor raises a compile-time error. These are legal in XPath 2.0.

In Xpath 1.0 one should use these, syntactically legal expressions:

self::node()[someCondition]

parent::node()[someCondition]

Upvotes: 2

hr_117
hr_117

Reputation: 9627

I'm not sure but if you have performance issues (and it was not only a theoretical question) you should have a look to <xsl:key.. and select="key... This can speed up transformation a lot depending on requirements and complexity.

Upvotes: 0

Borodin
Borodin

Reputation: 126752

They are identical. Most axes can be selected only using the full form, but there are abbreviations for the most common ones that make an XPath expression more concise.

  • child:: may be omitted

  • // == descendant-or-self::node()

  • @ == attribute::

  • . == self:node()

  • .. == parent::node()

Upvotes: 3

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