<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns="http://water.usgs.gov/XML/AQ" xmlns:xsd="http://www.w3.org/2001/XMLSchema" targetNamespace="http://water.usgs.gov/XML/AQ" elementFormDefault="qualified" version="1.0">
   <xsd:include schemaLocation="SiteIdentifier.xsd"/>
   <xsd:complexType name="AliasType" abstract="true">
      <xsd:annotation>
         <xsd:documentation>
            <Definition>Site identifier alias. An alternate identifier of a site.</Definition>
         </xsd:documentation>
      </xsd:annotation>
      <xsd:complexContent>
         <xsd:extension base="SiteIdentifierType"/>
      </xsd:complexContent>
   </xsd:complexType>
   <xsd:element name="Alias" type="AliasType" substitutionGroup="SiteIdentifier"/>
</xsd:schema>
