Get all datasets on topic "Livestock" using the AGROVOC URI for "Livestock"

PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX dc: <http://purl.org/dc/terms/> PREFIX dcat: <http://www.w3.org/ns/dcat#> PREFIX adms: <http://www.w3.org/ns/adms#> PREFIX doap: <http://usefulinc.com/ns/doap#> PREFIX owl: <http://www.w3.org/2002/07/owl#> PREFIX skos: <http://www.w3.org/2004/02/skos/core#> DESCRIBE ?dataset ?distro ?owner ?contact ?topic ?standard ?format ?protocol WHERE { ?dataset rdf:type dcat:Dataset . ?dataset dc:title ?title . ?dataset dc:publisher ?owner . ?dataset dcat:theme ?topic . ?topic owl:sameAs <http://aims.fao.org/aos/agrovoc/c_4397> . OPTIONAL { ?dataset doap:maintainer ?contact } OPTIONAL { ?distro dc:conformsTo ?standard } OPTIONAL { ?dataset dcat:distribution ?distro . ?distro dcat:accessURL ?url . ?distro dc:format ?format . ?distro adms:representationTechnique ?protocol } }