Thanks Wendell, I will try that! I think I have to go with the 1.0
version since Windows CE MSXML parser can only handle 1.0 expressions.
On Sat, Apr 16, 2011 at 12:37 AM, Wendell Piez
<wapiez(_at_)mulberrytech(_dot_)com> wrote:
Hi,
On 4/15/2011 2:22 PM, Chris wrote:
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On 04/15/2011 02:18 PM, Philipp Kursawe wrote:
Hmm I cannot use XSLT in my context. I can only use XPath. So I guess
I would have to select "en-us" first and see if there is a result, if
not select "en" and so on. Or could I "||" chain multiple XPath
selects?
//text[@id='color' and lang('en-us')] || //text[@id='color' and
lang('en')] || //text[@id='color']
Not sure what your context is... You can’t put the || in an XPath, but
if you’re in some procedural language like Perl or Java, then yes.
Pseudocode:
color_label = select( "//text[@id='color' and lang('en-us')]" ) ||
select( "//text[@id='color' and lang('en')]" ) ||
select( "//text[@id='color']" )
That would (presuming normal behavior of logical or) get the best match
for you.
Keep in mind, however, that what we have in XPath 1.0 "|" is a union
operation, not an "or". So,
//text[@id='color' and lang('en-us')] |
//text[@id='color' and lang('en')] |
//text[@id='color']
will get us all the nodes in //text that have @id='color', irrespective of
their lang() value, because the third term in the union collects them.
To do a cascading conditional like this in XPath 1.0 alone generally
requires building conditionals into the predicates, as in
//text[@id='color'][
@xml:lang='en-us' or
(@xml:lang='en' and not(../@xml:lang='en-us') or
not(../@xml:lang='en-us' or../@xml:lang='en')] ]
where the fallback cases (the second and third operands of the boolean 'or'
here) are excluded by filtering themselves out when the preferred cases are
available.
Here the attribute values are tested directly since the lang() function
works only on the context node, and we have to test the siblings. (So we
have to do without the case-insensitive test built into lang().)
This is easier in XPath 2.0, where we can do something like
//text[@id='color]/(.[lang('en-us')],.[lang('en')],.)[1]
Cheers,
Wendell
======================================================================
Wendell Piez
mailto:wapiez(_at_)mulberrytech(_dot_)com
Mulberry Technologies, Inc. http://www.mulberrytech.com
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Suite 207 Phone: 301/315-9631
Rockville, MD 20850 Fax: 301/315-8285
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