Some fixes

xmlschema.ast

@@ -49,6 +49,7 @@ XsList           : ComplexElement;
 XsMaxInclusive   : ComplexElement;
 XsMinInclusive   : ComplexElement;
 XsMinExclusive   : ComplexElement;
+XsMaxLength      : ComplexElement;
 XsMinLength      : ComplexElement;
 XsPattern        : ComplexElement;
 XsRestriction    : ComplexElement;

xmlschema.jjt

@@ -99,6 +99,7 @@ SPECIAL_TOKEN : /* COMMENTS */
   | < XS_MAXINCLUSIVE          : "xs:maxInclusive" >
   | < XS_MININCLUSIVE          : "xs:minInclusive" >
   | < XS_MINEXCLUSIVE          : "xs:minExclusive" >
+  | < XS_MAXLENGTH             : "xs:maxLength" >
   | < XS_MINLENGTH             : "xs:minLength" >
   | < XS_PATTERN               : "xs:pattern" >
   | < XS_RESTRICTION           : "xs:restriction" >
@@ -374,6 +375,7 @@ void Element() : {}
         | XsMaxInclusive()
         | XsMinInclusive()
         | XsMinExclusive()
+        | XsMaxLength()
         | XsMinLength()
         | XsPattern()
         | XsRestriction()
@@ -499,6 +501,12 @@ void XsList() #XsList : {}
 		 (">" ElementList() "</" <XS_LIST> ">" | ElementList() "/>")
 }
 
+void XsMaxLength() #XsMaxLength : {}
+{
+    <XS_MAXLENGTH> AttributeList() 
+		 (">" ElementList() "</" <XS_MAXLENGTH> ">" | ElementList() "/>")
+}
+
 void XsMinLength() #XsMinLength : {}
 {
     <XS_MINLENGTH> AttributeList()