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Demonstration of the Pattern Rewriter feature in the VOLT framework
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| prefix volt: <http://volt-name.space/ontology/> | |
| prefix input: <http://volt-name.space/vocab/input#> | |
| prefix output: <http://volt-name.space/vocab/input#> | |
| prefix dbp: <http://dbpedia.org/property/> | |
| # SPARQL query as it appears when sent to VOLT proxy | |
| select (sum(?population) as ?totalPopulation) where { | |
| ?matcher volt:firstMatch [ | |
| input:onVariable "?p"^^volt:Variable ; | |
| input:useValuesFrom (dbp:population dbp:populationTotal) ; | |
| input:sampleFromVariables ("?population"^^volt:Variable) | |
| ] . | |
| graph ?matcher { | |
| ?s ?p ?population . | |
| filter(isNumeric(?population)) | |
| } | |
| } | |
| # Actual expanded query that gets issued to the SPARQL endpoint | |
| select (sum(?population) as ?totalPopulation) { | |
| { select ?s ?p (sample(?_sample_population) as ?population) { | |
| { | |
| ?s ?p ?_sample_value . | |
| filter(isNumeric(?_sample_value)) | |
| values ?p { dbp:population } | |
| } union { | |
| ?place ?p ?_sample_value . | |
| filter(isNumeric(?_sample_value)) | |
| values ?p { dbp:populationTotal } | |
| filter not exists { | |
| ?place dbp:population ?_0_value . | |
| filter(isNumeric(?_0_value)) | |
| } | |
| } | |
| } group by ?s } | |
| } |
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