Bug 733451 - volatile declaration on member functions is not handled as xml attribute

src/compound.xsd

@@ -145,12 +145,12 @@
     <xsd:attribute name="id" type="xsd:string" />
     <xsd:attribute name="prot" type="DoxProtectionKind" />
     <xsd:attribute name="static" type="DoxBool" />
-    <xsd:attribute name="const" type="DoxBool" />
-    <xsd:attribute name="explicit" type="DoxBool" />
-    <xsd:attribute name="inline" type="DoxBool" />
-    <xsd:attribute name="virt" type="DoxVirtualKind" />
-    <xsd:attribute name="volatile" type="DoxBool" />
-    <xsd:attribute name="mutable" type="DoxBool" />
+    <xsd:attribute name="const" type="DoxBool" use="optional"/>
+    <xsd:attribute name="explicit" type="DoxBool" use="optional"/>
+    <xsd:attribute name="inline" type="DoxBool" use="optional"/>
+    <xsd:attribute name="virt" type="DoxVirtualKind" use="optional"/>
+    <xsd:attribute name="volatile" type="DoxBool" use="optional"/>
+    <xsd:attribute name="mutable" type="DoxBool" use="optional"/>
     <!-- Qt property -->
     <xsd:attribute name="readable" type="DoxBool" use="optional"/>
     <xsd:attribute name="writable" type="DoxBool" use="optional"/>

src/xmlgen.cpp

@@ -646,6 +646,11 @@ static void generateXMLForMember(MemberDef *md,FTextStream &ti,FTextStream &t,De
       t << " required=\"yes\"";
     }
 
+    if (al && al->volatileSpecifier)
+    {
+      t << " volatile=\"yes\"";
+    }
+
     t << " virt=\"";
     switch (md->virtualness())
     {
@@ -671,7 +676,6 @@ static void generateXMLForMember(MemberDef *md,FTextStream &ti,FTextStream &t,De
     {
       t << " initonly=\"yes\"";
     }
-
     if (md->isAttribute())
     {
       t << " attribute=\"yes\"";