[bugfix] XML Attribute names in the Range Index config should be of type QName and not NCName

Author: adamretter

schema/collection.xconf.xsd

@@ -333,7 +333,7 @@
         <xs:attribute name="at" type="xs:anyURI" use="required" form="unqualified"/>
     </xs:attributeGroup>
     <xs:attributeGroup name="attributeReq">
-        <xs:attribute name="attribute" type="xs:NCName" use="required"/>
+        <xs:attribute name="attribute" type="xs:QName" use="required"/>
     </xs:attributeGroup>
     <xs:attributeGroup name="boostOpt">
         <xs:attribute name="boost" type="xs:double" use="optional" form="unqualified"/>