<?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">block chains</dc:title><dc:identifier>http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31321112</dc:identifier><dc:language>en</dc:language><dc:publisher xml:lang="en">Getty Institute</dc:publisher><dcterms:created>2026-03-30 20:26:34</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">block chain</dcterms:alternative> <dcterms:alternative xml:lang="en">blockchains</dcterms:alternative> <dcterms:alternative xml:lang="en">chains, block</dcterms:alternative> <dc:description xml:lang="en"><![CDATA[ Chains comprising transverse blocks or cylinder units, joined by side links and held in place by pins. The blocks engage a driving wheel with teeth. An example of a block chain is used to rotate bicycle wheels and on other mechanical devices. ]]></dc:description></metadata>