My apologies that it took so long to finally try this, but yes, it does
exactly what I want :-)
It seems that the namespace bit is essential too, isn't it? In Paul's
example workflow (thanks Paul) I saw a lot of localname() functions in
his xpath queries, which also suggests that. It was only after I saw
this in your example that I realized namespaces can be an issue in
xpath.
Maybe Allen can add this as a note in the documentation too, or
preferably somewhere in Taverna, as clearly, people don't read
documentation :-[ .
Thanks again Carsten and all of you who gave tips!
Marco.
Carsten Byrman wrote:
Hi Marco,
Does //namesp1:iHOPsymbol/@id give you the attribute list you're
looking for?
Carsten
On 11-1-2010 12:51, Marco Roos wrote:
Hi Alan,
Did you try the example workflow I included?
In any case, Carsten Byrman was probably right when he suggested that
the web page from which I took the xpath example might simply be wrong
:-(
So, I assume things do work as expected.
I always struggle with xpath, very likely because I know too little
about xpath. Would you be able to tell me how to obtain the value of an
attribute in Taverna using the xpath widget (if at all possible)?
For instance, I would like to obtain a list of all identifier values
(id="..") of the iHOPsymbols from the output from an iHOP service:
<namesp1:result
xmlns:namesp1="http://www.pdg.cnb.uam.es/UniPub/iHOP/xml">
<iHOPrelatedSymbols
query="CRYAA" truncated="false"
xmlns="http://www.pdg.cnb.uam.es/UniPub/iHOP/xml">
<iHOPsymbol id="87442" name="crystallin, alpha A"
organism="Homo sapiens" organismId="1" symbol="CRYAA">
</iHOPsymbol>
<iHOPsymbol id="120256" name="crystallin, alpha A"
organism="Mus musculus" organismId="2" symbol="Cryaa">
</iHOPsymbol>
<iHOPsymbol id="73056" name="crystallin, alpha A"
organism="Danio rerio" organismId="141" symbol="cryaa">
</iHOPsymbol>
<iHOPsymbol id="2012896" name="crystallin, alpha A"
organism="Danio rerio" organismId="141" symbol="cryaa">
</iHOPsymbol>
<iHOPsymbol id="272094" name="crystallin, alpha A"
organism="Pan troglodytes" organismId="284" symbol="CRYAA">
</iHOPsymbol>
<iHOPsymbol id="313327" name="crystallin, alpha A"
organism="Bos taurus" organismId="383" symbol="CRYAA">
</iHOPsymbol>
<iHOPsymbol id="2093368" name="crystallin, alpha A"
organism="Oryctolagus cuniculus" organismId="517" symbol="CRYAA">
</iHOPsymbol>
<iHOPsymbol id="250108" name="crystallin, alpha A"
organism="Gallus gallus" organismId="626" symbol="CRYAA">
</iHOPsymbol>
<iHOPsymbol id="304928" name="crystallin, alpha A"
organism="Canis familiaris" organismId="659" symbol="CRYAA">
</iHOPsymbol>
<iHOPsymbol id="2059207" name="crystallin, alpha A"
organism="Macaca mulatta" organismId="830" symbol="CRYAA">
</iHOPsymbol>
<iHOPsymbol id="315772" name="crystallin, alpha A"
organism="Ovis aries" organismId="979" symbol="CRYAA">
</iHOPsymbol>
<iHOPsymbol id="2031945" name="crystallin, alpha A"
organism="Ornithorhynchus anatinus" organismId="8281" symbol="CRYAA">
</iHOPsymbol>
<iHOPsymbol id="3100988" name="crystallin, alpha A"
organism="Equus caballus" organismId="8726" symbol="CRYAA">
</iHOPsymbol>
<iHOPsymbol id="320508" name="crystallin, alpha A"
organism="Rattus norvegicus" organismId="8967" symbol="Cryaa">
</iHOPsymbol>
<iHOPsymbol id="232612" name="crystallin, alpha A"
organism="Xenopus laevis" organismId="438" symbol="cryaa-A">
</iHOPsymbol>
</iHOPrelatedSymbols>
</namesp1:result>
NB I don't think the iHOP service is listed in the standard set of
services in Taverna; I think it would make a nice addition. It is in
BioCatalogue.org.
Many thanks!
Marco.
Alan Williams wrote:
Hello everybody,
I've tried out some workflows and XPath expressions such as //@name do
work as expected. Marco, can you try other expressions with @ in them?
Thanks,
Alan
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