The problem is the following: When parsing a sparql request, I get simplified ast and I need to pass it to a third-party library for further processing, but the functionality out of the box (rdf4j) does not allow transferring ast in a machine-readable format, only tex, I would like to receive in json format.

StringBuilder qb = new StringBuilder(); qb.append(" PREFIX has_vaccine_allergen: <http://purl.obolibrary.org/obo/VO_0000531>\n" + " PREFIX chicken_egg_protein_allergen: <http://purl.obolibrary.org/obo/VO_0000912> \n" + " SELECT distinct ?vaccine_label ?vaccine \n" + " FROM <http://purl.obolibrary.org/obo/merged/VO>\n" + " WHERE {\n" + " ?vaccine rdfs:label ?vaccine_label .\n" + " ?vaccine rdfs:subClassOf ?vaccine_restriction .\n" + " ?vaccine_restriction owl:onProperty has_vaccine_allergen:; owl:someValuesFrom chicken_egg_protein_allergen: .\n" + "\t}"); SPARQLParser parser = new SPARQLParser(); ParsedTupleQuery q = (ParsedTupleQuery)parser.parseQuery(qb.toString(), null); TupleExpr te = q.getTupleExpr(); System.out.println(te);

The result of the code:

 SelectQuery [PrefixDecl (prefix=has_vaccine_allergen), PrefixDecl (prefix=chicken_egg_protein_allergen), SelectQuery] Distinct Projection ProjectionElemList ProjectionElem "vaccine_label" ProjectionElem "vaccine" Join Join Join StatementPattern Var (name=vaccine) Var (name=_const_9285ccfc_uri, value=http://www.w3.org/2000/01/rdf-schema#label, anonymous) Var (name=vaccine_label) StatementPattern Var (name=vaccine) Var (name=_const_4592be07_uri, value=http://www.w3.org/2000/01/rdf-schema#subClassOf, anonymous) Var (name=vaccine_restriction) StatementPattern Var (name=vaccine_restriction) Var (name=_const_a509c4e0_uri, value=http://www.w3.org/2002/07/owl#onProperty, anonymous) Var (name=_const_3319983d_uri, value=http://purl.obolibrary.org/obo/VO_0000531, anonymous) StatementPattern Var (name=vaccine_restriction) Var (name=_const_6539d60c_uri, value=http://www.w3.org/2002/07/owl#someValuesFrom, anonymous) Var (name=_const_3319a704_uri, value=http://purl.obolibrary.org/obo/VO_0000912, anonymous)

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