Yeah, this is rather advanced stuff. Let me see if I can walk you through some
ideas used in the yuml solution.
<ui:group>
<yuml:CollectSuperClasses arg:class="{= ?class }"/>
<yuml:CollectAssociations/>
<yuml:CollectAttributes/>
<yuml:ConcatClassesAndAttributes/>
<yuml:ConcatGeneralizations/>
<yuml:ConcatAssociations/>
<ui:group let:text="{#
SELECT ?text
WHERE {
GRAPH ui:tempGraph {
yuml:Subject yuml:text ?text .
} .
} }">
<img src="{=
fn:concat("http://yuml.me/diagram/dir:td/class/", ?text) }"/>
</ui:group>
</ui:group>
The surrounding ui:group doesn't do any output, just organizes the children
into order. The child elements yuml:... are executed from top to bottom, and
also don't create any XML output. They just update the ui:tempGraph. In this
particular case I need to prepare some helper structures to collect
superclasses and associations from multiple sources. Then, the code is building
a long string for the Http request. This is done using yuml:Concat, which has
the following prototype:
<ui:update ui:updateQuery="{!
DELETE {
GRAPH ui:tempGraph {
yuml:Subject yuml:text ?old .
}
}
INSERT {
GRAPH ui:tempGraph {
yuml:Subject yuml:text ?new .
}
}
WHERE {
GRAPH ui:tempGraph {
OPTIONAL {
yuml:Subject yuml:text ?old .
} .
} .
BIND (fn:concat(COALESCE(?old, ""), ?text) AS ?new) .
} }"/>
This basically replaces a given triple with the old value concatenated with a
new ?text. Since the order of execution in SWP is always top-down, this is like
programming in an imperative stateful language. The ui:tempGraph is discarded
after the function has finished, but it's global throughout the execution of
the SWP engine.
Not sure if this helps, but you have set yourself a rather challenging goal, so
I believe it may require a complex solution as well.
Holger
On Apr 5, 2011, at 1:43 AM, Peter Ward wrote:
> Or perhaps I should just learn the spr functions and build up what I need
> with the ui:commaSeperatedList and similar aggregators?
> I must admit, this is getting a bit esoteric.
>
> Peter
>
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