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Re: Can a single XPath statement duplicate the functi
Subject: Re: Can a single XPath statement duplicate the functionality of this verbose <xsl:choose> statement?
From: "Mark" <mark@xxxxxxxxxxxx>
Date: Sun, 23 Oct 2011 18:06:32 -0700
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Hi Dimitre,
Yours has just the opposite behavior of Ken's: his failed on the second
example, yours on the first; his succeeded on the first, yours on the second
.
Thanks,
Mark
returns nothing:
<Stamp>
<Formats souvenir-sheet="2895"/>
<Location denomination="1"/>
</Stamp>
Returns '1', correct
<Stamp>
<Formats souvenir-sheet="2896"/>
<Location denomination="5"/>
<Location souvenir-sheet="1"/>
</Stamp>
Thanks,
Mark
-----Original Message-----
From: Dimitre Novatchev
Sent: Sunday, October 23, 2011 5:51 PM
To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
Subject: Re: Can a single XPath statement duplicate the functionality
of this verbose statement?
Use:
for $n in @souvenir-sheet | @minisheet | @booklet | @se-tenant | @coupon,
$loc-n in ../Location/@*[name() = name($n)]
return
($loc-n, ../Location/@denomination, 0)[1]
This relies on the fact mentioned in the definition of the problem,
that the attributes are mutually exclusive (only one of them can be
present).
--
Cheers,
Dimitre Novatchev
---------------------------------------
Truly great madness cannot be achieved without significant intelligence.
---------------------------------------
To invent, you need a good imagination and a pile of junk
-------------------------------------
Never fight an inanimate object
-------------------------------------
You've achieved success in your field when you don't know whether what
you're doing is work or play
-------------------------------------
Facts do not cease to exist because they are ignored.
-------------------------------------
I finally figured out the only reason to be alive is to enjoy it.
On Sun, Oct 23, 2011 at 5:18 PM, G. Ken Holman
<gkholman@xxxxxxxxxxxxxxxxxxxx> wrote:
At 2011-10-23 17:10 -0700, Mark wrote:
Although they do have the virtue of giving me my desired output, can the
following sequence of statements be replaced by a more generalized
(shorter
and simpler) XPath statement without the repetitive "when" tests shown
below?
<xsl:choose>
<xsl:when test="@souvenir-sheet">
<xsl:copy-of select="if (../Location/@souvenir-sheet) then
../Location/@souvenir-sheet else if (../Location/@denomination) then
../Location/@denomination else '0' "/>
</xsl:when>
<xsl:when test="@minisheet">
<xsl:copy-of select="if(../Location/@minisheet) then
../Location/@minisheet else if(../Location/@denomination) then
../Location/@denomination else '0'"/>
</xsl:when>
<xsl:when test="@booklet">
<xsl:copy-of select="if(../Location/@booklet) then
../Location/@booklet else if(../Location/@denomination) then
../Location/@denomination else '0'"/>
</xsl:when>
<xsl:when test="@se-tenant">
<xsl:copy-of select="if (../Location/@se-tenant) then
../Location/@se-tenant else if(../Location/@denomination) then
../Location/@denomination else '0'"/>
</xsl:when>
<xsl:when test="@coupon">
<xsl:copy-of select=" if (../Location/@coupon) then
../Location/@coupon else if(../Location/@denomination) then
../Location/@denomination else '0'"/>
</xsl:when>
</xsl:choose>
My XPath is very weak.
I tried:
<xsl:copy-of select="if (../Location[name(@*)=name(@*)]) then
../Location/@* else if(../Location/@denomination) then
../Location/@denomination else '0'"></xsl:copy-of>
Presuming you have only a single attribute (the name() function will abend
if you have more than one), this may work for you ... it expresses a
sequence and selects the first member of that sequence:
<xsl:copy select="( ../Location[name(@*)=name(current()/@*)] ,
../Location/@denomination ,
'0' )[1]"/>
This relies on the XPath 2 behaviour of sequence ( (), x ) collapsing to
( x
).
Note the use of current() to return the node that was current at the start
of evaluating the XPath expression (also available in XPath 1).
I hope this helps.
. . . . . . . . . Ken
--
Contact us for world-wide XML consulting and instructor-led training
Crane Softwrights Ltd. http://www.CraneSoftwrights.com/s/
G. Ken Holman mailto:gkholman@xxxxxxxxxxxxxxxxxxxx
Google+ profile: https://plus.google.com/116832879756988317389/about
Legal business disclaimers: http://www.CraneSoftwrights.com/legal
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