POSC License Agreement
This file is distributed under the POSC License Agreement at
http://www.posc.org/about/license.shtml.
Use of this file constitutes agreement with the POSC License Agreement.
<xsd:documentation>The type of product whose relative content is being described.
This should be a specific component (e.g., water) rather than a phase (e.g., aqueous).</xsd:documentation>