my_exts.xsd

<?xml version="1.0" encoding="utf-8"?>
<!-- This is an example of a specific extension schema -->
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" xml:lang="EN" xmlns:target="http://PWS_Exts" targetNamespace="http://PWS_Exts">
	<xsd:element name="cool_element" type="xsd:string">
		<xsd:annotation>
			<xsd:documentation>
        This is a cool extension element
      </xsd:documentation>
		</xsd:annotation>
	</xsd:element>

</xsd:schema>