<?xml version="1.0" encoding="utf-8"?><rdf:RDF  xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"  xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"  xmlns:skos="http://www.w3.org/2004/02/skos/core#"  xmlns:map="http://www.w3c.rl.ac.uk/2003/11/21-skos-mapping#"  xmlns:dct="http://purl.org/dc/terms/"  xmlns:dc="http://purl.org/dc/elements/1.1/"><skos:ConceptScheme rdf:about="http://AATesaurus.cultura.gencat.cat/aat/getty_en">  <dc:title>Tesaurus d&apos;Art i Arquitectura</dc:title>  <dc:creator>Getty Institute</dc:creator>  <dc:contributor></dc:contributor>  <dc:publisher></dc:publisher>  <dc:rights></dc:rights>  <dc:subject></dc:subject>  <dc:description><![CDATA[  ]]></dc:description>  <dc:date>0000-00-00</dc:date>  <dct:modified>2024-01-24 15:40:44</dct:modified>  <dc:language>en</dc:language>  </skos:ConceptScheme>  <skos:Concept rdf:about="http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31437771"><skos:prefLabel xml:lang="en">barium carbonate</skos:prefLabel><skos:notation>300013785</skos:notation><skos:altLabel xml:lang="en">carbonate, barium</skos:altLabel> <skos:scopeNote xml:lang="en">Heavy white powder used as a pigment in the manufacture of paints, glazes and synthetic marble. When barium hydroxide is used as an alkalizing agent for paper, it can react with carbon dioxide and precipitate as barium carbonate to provide an alkaline reserve. Both barium hydroxide and barium carbonate are highly toxic. Barium carbonate is also used commercially in rat poison, bricks, cement, and mortar. It is occurs in nature as the mineral witherite.</skos:scopeNote><skos:inScheme rdf:resource="http://AATesaurus.cultura.gencat.cat/aat/getty_en"/><skos:related rdf:resource="http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31344570"/><skos:broader rdf:resource="http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31411089"/><skos:exactMatch> <skos:Concept rdf:about="http://AATesaurus.cultura.gencat.cat/aat/getty_ca/index.php?tema=9867699"> <skos:prefLabel xml:lang="ca">carbonat de bari</skos:prefLabel> </skos:Concept></skos:exactMatch><skos:exactMatch> <skos:Concept rdf:about="http://AATesaurus.cultura.gencat.cat/aat/getty_es/index.php?tema=14113684"> <skos:prefLabel xml:lang="es">carbonato bárico</skos:prefLabel> </skos:Concept></skos:exactMatch>  <dct:created>2026-03-30 20:58:01</dct:created>  </skos:Concept></rdf:RDF>