<?xml version="1.0" encoding="utf-8"?><metadata xmlns:dc="http://purl.org/dc/elements/1.1/"  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dcterms="http://purl.org/dc/terms/"><dc:title xml:lang="en">hydroxyapatite</dc:title><dc:identifier>http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31471162</dc:identifier><dc:language>en</dc:language><dc:publisher xml:lang="en">Getty Institute</dc:publisher><dcterms:created>2026-03-30 21:06:48</dcterms:created><dcterms:isPartOf xsi:type="dcterms:URI">http://AATesaurus.cultura.gencat.cat/aat/getty_en</dcterms:isPartOf><dcterms:isPartOf xml:lang="en">Tesaurus d&apos;Art i Arquitectura</dcterms:isPartOf><dc:format>text/html</dc:format> <dcterms:alternative xml:lang="en">calcium hydroxyapatite</dcterms:alternative> <dcterms:alternative xml:lang="en">calcium phosphate hydroxide</dcterms:alternative> <dcterms:alternative xml:lang="en">hydroxylapatite</dcterms:alternative> <dc:description xml:lang="en"><![CDATA[ A complex calcium phosphate, a naturally occuring mineral form of calcium apatite,  that serves as an important component of tooth enamel and vertebrate bone. In an archaeological context,  hydroxyapatite from human and animal remains is studied to reconstruct ancient diet. ]]></dc:description></metadata>