<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31344923</termId><termName>pearl</termName><termType>PT</termType><termNote><![CDATA[ A smooth round bead formed primarily within the shells of two distantly related groups of molluscan bivalves or clams, including the ocean-dwelling pearl oysters and the freshwater river mussels. Pearls are used in jewelry and for other ornamental puposes; they are considered a gem. ]]></termNote><termCreatedDate>2026-03-30 20:33:01</termCreatedDate><relation><relationType>UF</relationType><termId>31344924</termId><termName>pearls</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31320562</termId><termName>combination inorganic/organic animal material</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31375586</termId><termName>freshwater pearl</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>31375590</termId><termName>blister pearl</termName><termType>PT</termType></relation><relation><relationType>RT</relationType><termId>31320396</termId><termName>imitation pearl</termName><termType>PT</termType></relation></term>  </Zthes>