So I tried a new file jena.spatial+text.assembler.ttl with separate Lucene
indices for spatial and text:
https://github.com/jmvanel/semantic_forms/blob/master/scala/jena.spatial%2Btext.assembler.ttl
It defines a Dataset with both Dataset types and both Lucene indices:
:spatial_dataset rdf:type spatial:SpatialDataset ;
rdf:type text:TextDataset ;
spatial:dataset <#dataset> ;
spatial:index <#indexLucene> ;
text:dataset <#dataset> ;
text:index <#indexLucene> ;
.
Alas , when querying , it says "Failed to find the text index" :
WARN org.apache.jena.query.text.TextQueryPF - Failed to find the text
index : tried context and as a text-enabled dataset
WARN org.apache.jena.query.text.TextQueryPF - No text index - no text
search performed
Is it because rdf:type spatial:SpatialDataset is asserted first in
assembler file?
So, defining a hybrid Dataset does not work anymore by TTL specification
than by JVM code specification.
I definitely need more experts' advice .
Le sam. 15 déc. 2018 à 21:10, ajs6f <[email protected]> a écrit :
> > On Dec 15, 2018, at 9:59 AM, Marco Neumann <[email protected]>
> wrote:
> >
> >> *Question*: does that make sense to have a unique Lucene index for text
> and
> >> space ?
> >> It is possible at all? If yes, is it good in terms of disk space and
> >> performance?
> >> Like this:
> >> <#indexLucene> a text:TextIndexLucene ;
> >> a spatial:SpatialIndexLucene ;
> >> # etc ...
>
> I'm sure that would be ideal for many cases, but I'm not at all sure that
> the same index can answer queries of both kinds. Perhaps we can combine
> fields from both, but are the relationships between tuple and index record
> the same in both cases?
>
> Otherwise, I know we had a conversation at some point in the past on one
> of the lists about trying to factor out commonalities between jena-spatial
> and jena-text, but it didn't go very far at that time and I don't know what
> the intervening years have done to make it more or less feasible. There
> have been many changes to jena-text in that time and the new spatial module
> is a whole new story. I'd put a link here but searching lists.apache.org
> hasn't brought it up for me.
>
> ajs6f
>
>
--
Jean-Marc Vanel
http://www.semantic-forms.cc:9111/display?displayuri=http://jmvanel.free.fr/jmv.rdf%23me#subject
<http://www.semantic-forms.cc:9111/display?displayuri=http://jmvanel.free.fr/jmv.rdf%23me>
Rule-based programming, Semantic Web
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