Fix XSD issues

Author: robmen

src/xsd/wix/RegistryValueActionUnion.xsd

@@ -2,5 +2,5 @@
     <annotation>
       <documentation>Values of this type represent possible registry value actions.</documentation>
     </annotation>
-    <union memberTypes="RegistryValue PreprocessorVariables" />
+    <union memberTypes="RegistryValueAction PreprocessorVariables" />
   </simpleType>

src/xsd/wix/RequiredPrivilege.xsd

@@ -1,4 +1,4 @@
-<element name="RequiredPrivilege" type="xs:string">
+<element name="RequiredPrivilege">
     <annotation>
       <documentation>
         Privilege required by service configured by ServiceConfig parent.

src/xsd/wix/ServiceArgument.xsd

@@ -1,4 +1,4 @@
-<element name="ServiceArgument" type="xs:string">
+<element name="ServiceArgument">
     <annotation>
       <documentation>
         Argument used in ServiceControl parent

src/xsd/wix/SymbolPath.xsd

@@ -0,0 +1,12 @@
+<element name="SymbolPath">
+    <annotation>
+      <documentation>A path to symbols.</documentation>
+    </annotation>
+    <complexType>
+      <attribute name="Path" type="xs:string" use="required">
+        <annotation>
+          <documentation>The path.</documentation>
+        </annotation>
+      </attribute>
+    </complexType>
+  </element>

src/xsd/wix/order.txt

@@ -72,6 +72,7 @@ element|PatchInformation
 element|TargetProductCodes
 element|TargetProductCode
 element|PatchProperty
+element|SymbolPath
 element|SummaryInformation
 element|AssemblyName
 element|PatchCertificates