Added optionality for Arg. Added test case.

SDT/schema4.0/etc/domain.rnc

@@ -139,6 +139,7 @@ ArgDef =
   element Args {
     element Arg {
       attribute name { xsd:Name },
+      attribute optional { xsd:boolean }?,
       attribute semanticURI { xsd:anyURI }?,
       DocDef,
       DataTypeDef

SDT/schema4.0/src/domain.rng

@@ -386,6 +386,11 @@
 					<attribute name="name">
 						<data type="Name"/>
 					</attribute>
+					<optional>
+						<attribute name="optional">
+							<data type="boolean"/>
+						</attribute>
+					</optional>
 					<optional>
 						<attribute name="semanticURI">
 							<data type="anyURI"/>

SDT/schema4.0/src/domain.xsd

@@ -312,6 +312,7 @@
             <xs:element ref="DataType"/>
           </xs:sequence>
           <xs:attribute name="name" use="required" type="xs:Name"/>
+          <xs:attribute name="optional" type="xs:boolean"/>
           <xs:attribute name="semanticURI" type="xs:anyURI"/>
         </xs:extension>
       </xs:complexContent>

SDT/schema4.0/test/arg-test.xml

+<?xml version="1.0" encoding="iso-8859-1"?>
+<!-- Test the data types references -->
+
+<Domain id="arg-test" xmlns="http://homegatewayinitiative.org/xml/dal/4.0" xmlns:xi="http://www.w3.org/2001/XInclude">
+
+	<ModuleClasses>
+		<ModuleClass name="TestArg">
+			<Actions>
+				<Action name="testAction">
+					<Args>
+						<Arg name="argMandatory">
+							<DataType>
+								<SimpleType type="boolean" />
+							</DataType>
+						</Arg>
+						<Arg name="argOptional" optional="true">
+							<DataType>
+								<SimpleType type="boolean" />
+							</DataType>
+						</Arg>
+					</Args>
+				</Action>
+			</Actions>
+		</ModuleClass>
+	</ModuleClasses>
+
+</Domain>
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