edit_xml XPath version

[Geoff Gibbs]

Can anyone tell me which version of XPath is used by edit_xml bundles?

[Aleksey Tsalolikhin]

On Thu, Sep 15, 2016 at 6:18 AM, Geoff Gibbs <geoff...@diamond.ac.uk> wrote:

Can anyone tell me which version of XPath is used by edit_xml bundles?

Dear Geoff,

The short answer is: XPath 1.0.

Here is how I got that answer:

CFEngine uses libxml2 for the XML functionality provided by edit_xml bundles:

root@tashkent:~# cf-agent -V

CFEngine Core 3.7.3

CFEngine Enterprise 3.7.3

root@tashkent:~# ldd `which cf-agent`|grep  xml

libxml2.so.2 => /var/cfengine/lib/libxml2.so.2 (0x00007fba412b9000)

root@tashkent:~# 

So, what version of XPath does libxml2 support?

According to StackOverflow, libxml2 does not yet support XPath 2.0:

1. http://stackoverflow.com/questions/6586896/does-libxml2-support-xpath-2-0-or-not

2. http://stackoverflow.com/questions/13646303/xpath-2-0-libxml2

Latest libxml2 source code from ftp://xmlsoft.org/libxml2/libxml2-2.9.4.tar.gz contains xpath.c which begins with:

/*

 * xpath.c: XML Path Language implementation

 *          XPath is a language for addressing parts of an XML document,

 *          designed to be used by both XSLT and XPointer

 *

 * Reference: W3C Recommendation 16 November 1999

 *     http://www.w3.org/TR/1999/REC-xpath-19991116

Go to http://www.w3.org/TR/1999/REC-xpath-19991116 and you'll see:

XML Path Language (XPath)

Version 1.0

W3C Recommendation 16 November 1999, revised 7 September 2015

Hope this helps!

Best,

Aleksey

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ᐧ

[Geoff Gibbs]

Unfortunate. But thank you.

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[Aleksey Tsalolikhin]

You are welcome, Geoff.  :-)

Unfortunate. But thank you.

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