<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>31352078</termId><termName>undersea shelf valleys</termName><termType>PT</termType><termNote><![CDATA[ Valleys on shelves on the sea floor; generally the shoreward extensions of canyons.  ]]></termNote><termCreatedDate>2026-03-30 20:35:01</termCreatedDate><relation><relationType>UF</relationType><termId>31352079</termId><termName>undersea shelf valley</termName><termType>ND</termType></relation><relation><relationType>UF</relationType><termId>31352080</termId><termName>valleys, undersea shelf</termName><termType>ND</termType></relation><relation><relationType>BT</relationType><termId>31324173</termId><termName>undersea landforms</termName><termType>PT</termType></relation></term>  </Zthes>