Posted by Thorsten Stumpf on Feb 28, 2011; 6:57pm
URL: https://discuss.orbeon.com/Using-XSD-IDREFS-ID-typed-elements-to-identify-relevant-elements-tp3328493.html

Hi!

We're still using 3.7.1 but my question seems to be a rather general
one.

I want to identify and reference one or more elements by their attribute
id.
The id attributes have been declared to be of type id and the attribute
ref has been declared as IDREFS.

Orbeon obviously doesn't recognize the IDs as IDs and the IDREFS as
IDREFS.
See below example for example structure:

<toys xmlns:bar="http://www.foo.com/FooBarML"
xmlns="http://www.foo.com/FooML"
xmlns:baz="http://www.foo.com/FooBazML">
        <request>
            <id>201114</id>
            <method>com.foo.product.get</method>
            <parameter>
                <company>toyland</company>
                <vid>v1029983</productid>
            </parameter>
        </request>
        <data>
                <baz:products>
                    <baz:product producttype="cartoon" id="p395033">
                        <baz:title>Malibu Stacy</baz:title>
                        <baz:variant available="true" id="v1029982">
                            <baz:title>Sand</baz:title>
                            <baz:home alternatives="v1029983 v1029984">
                                <baz:value>Beachhouse</baz:value>
                            </baz:arrival>
                        </baz:variant>
                        <baz:variant available="true" id="v1029983">
                            <baz:title>Business</baz:title>
                            <baz:home alternatives="v1029982 v1029984">
                                <baz:value>Penthouse</baz:value>
                            </baz:arrival>
                        </baz:variant>
                        <baz:variant available="true" id="v1029984">
                            <baz:title>Sport</baz:title>
                            <baz:home alternatives="v1029982 v1029983">
                                <baz:value>Tent</baz:value>
                            </baz:arrival>
                        </baz:variant>
...

What I want to do is to get all available product variant nodes of the
selected node (which is here defined by /toys/request/parameter/vid).
XPath/XSL-T offers a quite good way to do so: using either the function
'id' or 'key'.

But key has to be declared whereas id should be available for all nodes
having a "schema"declared id.

        id(//request/parameter/vid)

should return the 'Business' variant of Malibu Stacy (in production we
let the user choose the wished product option).

If the user selected any of these product variants we want to offer the
different other choices of product variants. It should be possible to
get all other types of home of these variants by querying for

        id(id(//request/parameter/vid)/home/@alternatives)/baz:home

returning a node set like

                            <baz:home alternatives="v1029983 v1029984">
                                <baz:value>Beachhouse</baz:value>
                            </baz:arrival>
                            <baz:home alternatives="v1029982 v1029983">
                                <baz:value>Tent</baz:value>
                            </baz:arrival>

with the 'home's subtree of the referenced variants.
I also tried to set an generic XML-ID attribute by xml:id. But it didn't
work out as well.

Of course this is just an example - the structure of our XML is a bit
more complex though it is basically the same!

Orbeon returns an empty result set (produced by the XPath function id -
or it doesn't work at all).
Can you give me a hint what's wrong?

Thanks,

JT


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