Select Unique

[Mystagogue]

Given XML like this...

<stuff>
<thing id="1" result="true"/>
<thing id="2" result="true"/>
<thing id="3" result="false"/>
<thing id="4" result="false"/>
<thing id="5" result="error"/>
</stuff>

Is there an XPath statement that will select only *unique* "@result"
samples? For example, given the above, I'd like to have "thing"
results that consist only of id 1, 3 and 5, because id 2 and 4 are
duplicate result types. Anybody?

[TOUDIdel]

Uzytkownik "Mystagogue" <ba****@axiscode.comnapisal w wiadomosci
news:72**********************************@18g2000h sf.googlegroups.com...

Given XML like this...

<stuff>
<thing id="1" result="true"/>
<thing id="2" result="true"/>
<thing id="3" result="false"/>
<thing id="4" result="false"/>
<thing id="5" result="error"/>
</stuff>

Is there an XPath statement that will select only *unique* "@result"
samples? For example, given the above, I'd like to have "thing"
results that consist only of id 1, 3 and 5, because id 2 and 4 are
duplicate result types. Anybody?

In my opinion quite good way is using "attributes features". It does mean in
one element you may have attributes only with unique names. For example:

<xsl:apply-templates select=//@*/>
....
<xsl:template match="@*">
<xsl:attribute name="{.}">whatever</xsl:attribute>
</xsl:template>

Result: element with attributes done from unigue (distinct) values

--
td
xmlguru.net

[Pavel Lepin]

Mystagogue <ba****@axiscode.comwrote in
<72**********************************@18g2000hsf.g ooglegroups.com>:

<stuff>
<thing id="1" result="true"/>
<thing id="2" result="true"/>
<thing id="3" result="false"/>
<thing id="4" result="false"/>
<thing id="5" result="error"/>
</stuff>

Is there an XPath statement that will select only *unique*
"@result" samples?

Not possible with pure XPath1. In XPath2:

for $a in /stuff/* return
if (not($a/preceding-sibling::*[@result=$a/@result]))
then $a
else /..

--
....also, I submit that we all must honourably commit seppuku
right now rather than serve the Dark Side by producing the
HTML 5 spec.

[Martin Honnen]

Mystagogue wrote:

Given XML like this...

<stuff>
<thing id="1" result="true"/>
<thing id="2" result="true"/>
<thing id="3" result="false"/>
<thing id="4" result="false"/>
<thing id="5" result="error"/>
</stuff>

Is there an XPath statement that will select only *unique* "@result"
samples?

Yes:
/stuff/thing[not(@result = preceding-sibling::thing/@result)]

--

Martin Honnen
http://JavaScript.FAQTs.com/

[Pavel Lepin]

Martin Honnen <ma*******@yahoo.dewrote in
<47***********************@newsspool4.arcor-online.net>:

Mystagogue wrote:

><stuff>
<thing id="1" result="true"/>
<thing id="2" result="true"/>
<thing id="3" result="false"/>
<thing id="4" result="false"/>
<thing id="5" result="error"/>
</stuff>

Is there an XPath statement that will select only
*unique* "@result" samples?

/stuff/thing[not(@result =
preceding-sibling::thing/@result)]

Well, I'll be damned. It's been a year and a half and I
still miss clever but essentially simple tricks like that.

--
....also, I submit that we all must honourably commit seppuku
right now rather than serve the Dark Side by producing the
HTML 5 spec.