On 18/08/2020 13:41, Tim Smith wrote:
Hi Holger,
I was thinking it worked like SPARQL syntax.
It does work like SPARQL, but the ui:update/ui:transaction elements need
to decide when to physically write the triples to the file, and that is
easier to do if only the context graph is modified. I am sure this could
be improved but that's how it works at the moment.
Holger
Thanks for clearing that up! Now my SWPs will be much more effective. :)
Tim
On Mon, Aug 17, 2020, 7:11 PM Holger Knublauch <hol...@topquadrant.com
<mailto:hol...@topquadrant.com>> wrote:
Hi Tim,
you were almost there. The missing info is that ui:update will
only write to the context graph when done, not any graph mentioned
in the INSERT. So change it to
<ui:setContext
ui:queryGraph="<http://example.com/swp_write_to_graph_output>";>
<ui:update ui:updateQuery="{!
INSERT {
?s ?p ?o .
}
WHERE {
GRAPH ui:tempGraphFinalOutput {
?s ?p ?o .
} .
} }"/>
</ui:setContext>
which makes the target graph the active context graph while the
source graph is moved into the WHERE clause.
You may also want to wrap the ui:update with a ui:transaction if
you want to bundle multiple updates into a single save step. It
will otherwise auto-create a transaction for each nested ui:update.
HTH and thanks for taking the time to prepare the bundled example.
Holger
On 18/08/2020 05:34, Tim Smith wrote:
Hi,
I cannot write to an existing graph in the workspace from an
SWP. This is a problem that has plagued me since TBC 5.1.4 so
perhaps I'm doing something wrong. I've attached a minimal
example as a project.
The file, swp_write_to_graph.ui.ttlx contains a subclass of
ui:Services called w2g:w2graph. In the ui:prototype, I populate
a temp graph (ui:tempGraphFinalOutput) with a single triple.
ui:prototype shown below.
Next, I dump the temp graph to a temporary file using
ui:dumpGraph to ensure ui:tempGraphFinalOutput contains the
triple. This works as expected. Then I try to insert the
contents into an RDF file that exists in the workspace. This
file contains nothing but the triples TBC creates when a new RDF
file is created.
The SWP call completes successfully but the single triple is not
inserted into the existing graph.
The SWP is called using:
http://localhost:8083/tbl/swp?_viewClass=w2g:w2graph&outputGraph=http://example.com/swp_write_to_graph_output&_contextdebug=true
What am I missing such that I cannot insert triples into existing
graphs from an SWP?
Note that my ultimate goal is to pass the name of the output
graph into the SWP so you will see a constraint setup for that
purpose but it is not used in this example.
Any help would be appreciated. I need to create a number of SWPs
and being able to manipulate graphs at will is a skill I need.
Tim
<ui:group let:outputFileGraph="{= IRI(?outputGraph) }">
<h3>The output graph is {= ?outputGraph } Graph: {=
?outputFileGraph }</h3>{= smf:trace("Populating the temp graph...
") }<ui:update ui:updateQuery="{!
INSERT {
GRAPH ui:tempGraphFinalOutput {
?uri rdfs:label "I am a Thing" .
} .
}
WHERE {
BIND
(spif:buildURI("<http://example.com/{?1}>"
<http://example.com/%7B?1%7D>">;,
"i_am_a_thing") AS ?uri) .
} }"/>{= smf:trace("Finished!") }
{= smf:trace("Dumping to the debug graph...") }<ui:dumpGraph
ui:filePath="/SWP_Example/swp_write_to_graph_debug_output.ttl"
ui:graph="ui:tempGraphFinalOutput"/>
<!-- Try to insert into the output graph -->{=
smf:trace("Writing output graph... ") }<ui:setContext
ui:queryGraph="ui:tempGraphFinalOutput">
<ui:update ui:updateQuery="{!
INSERT {
GRAPH
<http://example.com/swp_write_to_graph_output> {
?s ?p ?o .
} .
}
WHERE {
?s ?p ?o .
} }"/>
</ui:setContext>
</ui:group>
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