[xml] xpath number()/string() and locale

Hi all,

I think that the way the string() function in libxml2 xpath works is wrong according to the xpath specification. Please have a look at the following thoughts and let me know what you think so I can put together a patch.

Consider the following xml document:

<?xml version="1.0"?>

and the following xpath expression:


Should LC_NUMERIC (or LC_ALL) be set to a language that uses a decimal seperator other then the '.' character the above expression will result in NaN being returned, since the string() function will use snprintf() in order to format the number to a string. The resulting string however cannot be used as a number again.

http://www.w3.org/TR/xpath states:

[30] Number ::= Digits ('.' Digits?)? | '.' Digits

...otherwise, the number is represented in decimal form as a Number including a decimal point... NOTE: The string function is not intended for converting numbers into strings for presentation to users. The format-number function and xsl:number element in [XSLT] provide this functionality.

With the string() function ultimately using snprintf() in order to format it's outoput it does not fullfill the requirement of representing a number in a language neutral form. Also the scientific notation that might be generated from xmlXPathFormatNumber() is not allowed by the specification since it does not conform to 3.7[30]

I would rewrite the xmlXPathFormatNumber() in a way where it just dumps out the numbers according to xpath 3.7 and leave the rest to xslt:format-number. What do you think?


Lars Oppermann <lars oppermann sun com>               Sun Microsystems
Software Engineer - StarOffice                           Sachsenfeld 4
Phone: +49 40 23646 959                                D-20097 Hamburg
Fax:   +49 40 23646 550                  http://www.sun.com/staroffice

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