XPath in XUpdate DOES work though (was RE: Xindice doesn't fully support XPath? /@attribute doesn't work!)

[Dominic Gamble <do...@stratlink.com.au>]

The following XUpdate query, which uses XPath works under Xindice no
probs:

<xupdate:modifications version="1.0"
xmlns:xupdate="http://www.xmldb.org/xupdate">
<xupdate:update select="/Classes/Class[last()]/@id">999</xupdate:update>
</xupdate:modifications>

please note the XPath:

/Classes/Class[last()]/@id

Why does it work for XUpdateQueryService, but not for XPathQueryService?
I may have a play around with the source code to see what's happening.

Thanks
Dominic Gamble

On Fri, 2002-04-05 at 17:49, Mark J. Stang wrote:
> For example:
> 
> xindice xpath -c /db/customers -q "/account[@name='Stang']"
> 
> will return all documents that have a root element named
> account with an attribute of 'Stang'.   In my previous example,
> if my document contained an element with an attribute of "mark",
> then it would return the entire element...
> 
> HTH,
> 
> Mark
> 
> "Mark J. Stang" wrote:
> 
> > Everyone is correct, it doesn't work.   It is not Xindice, but rather
> > the XML:DB or DB:XML or something like that API that doesn't
> > support it.   So until the API is updated, Xindice doesn't support
> > it.   HOWEVER, this is not to say that you can't get back the
> > node that contains the attribute.   I have nodes like:
> >
> > <name first="mark" last="stang" />
> >
> > And I do searches for "mark" or "stang" and they work, they just
> > return then entire node.   So, you get more than you asked for.
> > And if you search for an attribute of the root node, then you can
> > get the entire document.
> >
> > Check out:
> >
> >      http://www.zvon.org/xxl/XPathTutorial/General/examples.html
> >
> > I have yet to find any bugs in the XPath queries :-).
> >
> > HTH,
> >
> > Mark
> >
> > Maarten Eerdekens wrote:
> >
> > > Xindice can only return a nodeset as a result of a xpath query,
> > > and because attributes are no nodes, this returns nothing.
> > > You will have to make a work around.
> > > I think I heard the experts are working on it.
> > >
> > > -----Original Message-----
> > > From: Dominic Gamble [mailto:dominic@stratlink.com.au]
> > > Sent: vrijdag 5 april 2002 8:55
> > > To: xindice-users@xml.apache.org
> > > Subject: Xindice doesn't fully support XPath? /@attribute doesn't work!
> > >
> > > It seems that XPath /@attribute queries don't work in Xindice! Please
> > > tell me I am wrong.
> > >
> > > When I execute the following xpath query:
> > >
> > > xindice xpath -c /db/websystem -q "/Classes/Class[last()]"
> > >
> > > I get the following results:
> > >
> > > <?xml version="1.0"?>
> > > <Class name="Page" id="1" superclass="1" template="1"
> > > xmlns:src="http://xml.apache.org/xindice/Query" src:col="/db/websystem"
> > > src:key="class">
> > >         <Elements>
> > >                 <Element name="Title" class="Single Line Text" required="true" />
> > >                 <Element name="Author" class="Single Line Text" required="false" />
> > >                 <Element name="Keywords" class="Single Line Text" required="false" />
> > >                 <Element name="Description" class="Single Line Text" required="false"
> > > />
> > >         </Elements>
> > > </Class>
> > >
> > > This is all ok, but when I then attempt to get the attribute 'id' only,
> > > using the following query:
> > >
> > > xindice xpath -c /db/websystem -q "/Classes/Class[last()]/@id"
> > >
> > > I get NOTHING! This happens both from the command line, _and_ from
> > > within code.
> > >
> > > Does anyone know why? Has it just not been implemented?
> > > I'm using Xindice 1.0.
> > >
> > > Thanks,
> > > Dominic Gamble
> > > Stratlink
>