Fix #2512

Author: sydb

P5/Source/Specs/att.calendarSystem.xml

@@ -26,7 +26,7 @@ $Id$
       <datatype minOccurs="1" maxOccurs="unbounded">
         <dataRef key="teidata.pointer"/>
       </datatype>
-      <constraintSpec ident="calendar" scheme="schematron">
+      <constraintSpec ident="calendar_attr_on_empty_element" scheme="schematron">
         <constraint>
           <sch:rule context="tei:*[@calendar]">
             <sch:assert test="string-length( normalize-space(.) ) gt 0"> @calendar indicates one or more