Hi Peter,
UISPIN makes it possible to evaluate result sets in any node, using letrs:...
attributes. Using this technique, you can add an ui:if before opening up the
table. The result set is then a normal SPARQL variable, which points to a SPIN
Result Set (http://spinrdf.org/spr.html) and you can use the spr functions such
as spr:rowCount to do meta-analysis of the table. The resulting snippet may
look like this (note: I did not test this, so it may have syntax errors):
<ui:let letrs:data="{#
SELECT ?attrib ?value
WHERE { ... } }">
<h4>...</h4>
<ui:if ui:condition="{= spr:rowCount(?data) > 0 }">
<table>
<ui:forEach ui:resultSet="{= ?data }">
<tr>....</tr>
</ui:forEach>
</table>
</ui:if>
</ui:let>
BTW, the ifs in your snippet look like the body of <tui:Label> which you may
want to reuse.
Let me know if you have further questions - feedback like this helps me
understand the startup problems that new users of UISPIN are facing.
Thanks,
Holger
On Apr 21, 2010, at 11:55 PM, peter wrote:
> I'm having good fun with UISPIN to create architecture description
> documents. I'm refactoring my template by moving common structures
> into tui:Element subclasses. I think this what your tutorial
> advocates. My specific question is, given a table generation loop such
> as below, is there a neat way of suppressing the whole table (and
> header) if there is no content?
>
> Peter
>
> <ui:let>
> <h4>{= ui:label(?predicate) }</h4>
> <table>
> <ui:forEach ui:resultSet="{#
> SELECT ?attrib ?value
> WHERE {
> ?attrib rdfs:subPropertyOf ?predicate .
> ?node ?attrib ?value .
> } }">
> <tr>
> <td>{= ui:label(?attrib) }</td>
> <td>
> <ui:if ui:condition="{= isLiteral(?value) }">
> <span class="tuiLabel">{= ?value }</span>
> </ui:if>
> <ui:if ui:condition="{= isIRI(?value) || isBlank(?
> value) }">
> <span class="tuiResource">{= ui:label(?value) }
> </span>
> </ui:if>
> </td>
> </tr>
> </ui:forEach>
> </table>
> </ui:let>
>
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