Hi Felix,
constructing rdf:Lists from SPARQL is notoriously hard. We have a
work-around "magic property" that works for some use cases but not
others, but I mention it here:
/**
<span class="style1">tops:constructRDFList</span>
<p>(Experimental) This function binds variables for constructing an RDF
list.
It can be best used in a CONSTRUCT query. It is an experimental
function, so it may work
only in certain cases.</p>
<ul>
<li><i>Syntax:</i> <span class="style1">(?list ?subList ?element ?rest)
tops:constructRDFList (?s ?p ?o) .</span></li>
<li><i>Description:</i> The function iterates through <span
class="style1">?s ?p ?o</span> to
bind variables for constructing a list. Currently, only one variable in
<span class="style1">?s ?p ?o</span>
should be unassigned, and the other two should be assigned. Also the
property "rdf:type" should be used instead of "a".
<span class="style1">?list</span> variable is used as the head
of the list and stays constant throughout the iteration, <span
class="style1">?subList</span>
is used as the sub heads of the list and changes with each iteration,
<span class="style1">?element</span>
is the unbound variable in <span class="style1">?s ?p ?o</span> and
changes with each iteration,
and <span class="style1">?rest</span> is the bound <span
class="style1">?subList</span> of the
next iteration, which the current iteration points to.</li>
<li><i>Example:</i> In the following query, <span
class="style1">tops:constructRDFList</span> constructs
an <span class="style1">owl:oneOf</span> list of colleges. Here is the
query and its usage in kennedys ontology:</li>
<pre>
CONSTRUCT {
kennedys:College owl:oneOf ?list .
?subList rdf:first ?element .
?subList rdf:rest ?rest .
}
WHERE {
(?list ?subList ?element ?rest) tops:constructRDFList (?s
rdf:type kennedys:College) .
}
</pre>
</ul>
<p><b>Known limitations:</b> Only one variable in <span
class="style1">?s ?p ?o</span>
should be unassigned, and the other two should be assigned. The property
"rdf:type" should be used instead of "a" in the function.</p>
*/
It depends on how the WHERE clause looks like whether this could be used
in your scenario. The tops namespace is http://www.topbraid.org/tops
But for complex tasks involving recursive data structures such as
rdf:Lists you'll be better off using a generic scripting language such
as TopBraid's ADS JavaScript support.
Holger
On 2022-03-15 1:17 am, 'Felix Sasaki' via TopBraid Suite Users wrote:
This is rather a SPARQL question, but asking here since I have a
SHACL use case.
I want to generate the items in sh:in out of existing RDF data. I have
a CONSTRUCT query that looks like below:
CONSTRUCT {
ex:fooShape a sh:PropertyShape;
sh:path ex:foo
sh:in @@@ .
}
WHERE
{
SELECT ?listItem WHERE {
# Query that creates bindings for ?listItem
}
}
How should the part @@@ be written so that the object of the predicate
sh:in becomes an RDF list, filled with ?listItem?
Best,
Felix
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