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/usr/share/foomatic/xmlschema/option.xsd is in foomatic-db 20160212-0ubuntu1.

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The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
			elementFormDefault="qualified">

	<xsd:include schemaLocation="types.xsd" />
	
	<xsd:simpleType name="optionTypes">
		<xsd:restriction base="xsd:string">
			<xsd:enumeration value="enum" />
			<xsd:enumeration value="bool" />
			<xsd:enumeration value="int" />
			<xsd:enumeration value="float" />
			<xsd:enumeration value="string" />
			<xsd:enumeration value="password" />
		</xsd:restriction>
	</xsd:simpleType>
	
	<xsd:simpleType name="optionID">
		<xsd:restriction base="xsd:string">
			<xsd:pattern value="opt/[a-zA-Z0-9]([a-zA-Z0-9_\.-])*" />
		</xsd:restriction>
	</xsd:simpleType>
	
	<xsd:simpleType name="evalID">
    	<xsd:restriction base="xsd:string">
    		<xsd:pattern value="ev/[a-zA-Z0-9]([a-zA-Z0-9_\.-])*">
			</xsd:pattern>
		</xsd:restriction>
	</xsd:simpleType>
	
	<xsd:complexType name="constraintData">
		<xsd:all>
			<xsd:element name="make" type="xsd:string" minOccurs="0" />
			<xsd:element name="model" type="xsd:string" minOccurs="0" />
			<xsd:element name="driver" type="xsd:string" minOccurs="0" />
			<xsd:element name="printer" type="xsd:string" minOccurs="0" />
			<xsd:element name="arg_defval" type="xsd:string" minOccurs="0" />
		</xsd:all>
		<xsd:attribute name="sense" type="xsd:boolean" />
	</xsd:complexType>
	
	<xsd:element name="option">
    	<xsd:complexType>
    		<xsd:all>
                <xsd:element name="arg_longname" type="i18nString" />
                <xsd:element name="arg_shortname" type="i18nString" />
    			<xsd:element name="arg_execution">
    				<xsd:complexType>
    					<xsd:all>
    						<xsd:element name="arg_group" type="xsd:string" minOccurs="0" />
    						<xsd:element name="arg_order" type="xsd:int" minOccurs="0" />
    						<xsd:element name="arg_section" type="xsd:string" minOccurs="0" />
    						<xsd:element name="arg_spot" minOccurs="0">
    							<xsd:simpleType>
    								<xsd:restriction base="xsd:string">
    									<xsd:pattern value="[a-zA-Z]" />
    								</xsd:restriction>
    							</xsd:simpleType>
    						</xsd:element>
    						<xsd:element name="arg_required" minOccurs="0">
    							<xsd:complexType />
    						</xsd:element>
    						<xsd:element name="arg_substitution" minOccurs="0">
    							<xsd:complexType />
    						</xsd:element>
    						<xsd:element name="arg_postscript" minOccurs="0">
    							<xsd:complexType />
    						</xsd:element>
    						<xsd:element name="arg_pjl" minOccurs="0">
    							<xsd:complexType />
    						</xsd:element>
    						<xsd:element name="arg_composite" minOccurs="0">
    							<xsd:complexType />
    						</xsd:element>
    						<xsd:element name="arg_forced_composite" minOccurs="0">
    							<xsd:complexType />
    						</xsd:element>
    						<xsd:element name="arg_proto" type="xsd:string"  minOccurs="0"/>
    					</xsd:all>
    				</xsd:complexType>
    			</xsd:element>
    			<xsd:element name="constraints" minOccurs="0">
    				<xsd:complexType>
    					<xsd:sequence>
    						<xsd:element name="constraint" type="constraintData" maxOccurs="unbounded" />
    					</xsd:sequence>
    				</xsd:complexType>
    			</xsd:element>
    			<xsd:element name="comments" type="i18nString" minOccurs="0" />
    			<xsd:element name="arg_max" type="xsd:float" minOccurs="0" />
    			<xsd:element name="arg_min" type="xsd:float" minOccurs="0" />
    			<xsd:element name="arg_shortname_false" type="i18nString" minOccurs="0" />
    			<xsd:element name="arg_maxlength" type="xsd:int" minOccurs="0" />
    			<xsd:element name="arg_allowedchars" type="xsd:string" minOccurs="0" />
    			<xsd:element name="arg_allowedregexp" type="xsd:string" minOccurs="0" />
    			<xsd:element name="enum_vals" minOccurs="0">
    				<xsd:complexType>
    					<xsd:sequence>
    						<xsd:element name="enum_val" maxOccurs="unbounded">
    							<xsd:complexType>
    								<xsd:all>
    									<xsd:element name="ev_longname" type="i18nString" />
    									<xsd:element name="ev_shortname" type="i18nString" />
    									<xsd:element name="ev_driverval" type="xsd:string" />
									<xsd:element name="comments" type="i18nString"  minOccurs="0" />
    									<xsd:element name="constraints" minOccurs="0">
    										<xsd:complexType>
    											<xsd:sequence>
    												<xsd:element name="constraint" type="constraintData" maxOccurs="unbounded" />
    											</xsd:sequence>
    										</xsd:complexType>
    									</xsd:element>
    								</xsd:all>
    								<xsd:attribute name="id" type="evalID" use="required" />
    							</xsd:complexType>
    						</xsd:element>
    					</xsd:sequence>
    				</xsd:complexType>
    			</xsd:element>
    		</xsd:all>
    		<xsd:attribute name="type" type="optionTypes" use="required" />
    		<xsd:attribute name="id" type="optionID" use="required" />
    	</xsd:complexType>
    </xsd:element>
</xsd:schema>