Index: trunk/psModules/src/concepts/pmConcepts.h
===================================================================
--- trunk/psModules/src/concepts/pmConcepts.h	(revision 11749)
+++ trunk/psModules/src/concepts/pmConcepts.h	(revision 12285)
@@ -4,6 +4,6 @@
  * @author Paul Price, IfA
  *
- * @version $Revision: 1.12 $ $Name: not supported by cvs2svn $
- * @date $Date: 2007-02-12 22:22:15 $
+ * @version $Revision: 1.13 $ $Name: not supported by cvs2svn $
+ * @date $Date: 2007-03-07 00:10:36 $
  * Copyright 2005-2006 Institute for Astronomy, University of Hawaii
  */
@@ -62,4 +62,5 @@
     pmConceptParseFunc parse;           ///< Function to call to read the concept
     pmConceptFormatFunc format;         ///< Function to call to write the concept
+    bool required;                      ///< Is concept required (throw an error on problems)?
 }
 pmConceptSpec;
@@ -68,6 +69,18 @@
 pmConceptSpec *pmConceptSpecAlloc(psMetadataItem *blank, ///< Blank value; contains the name
                                   pmConceptParseFunc parse, ///< Function to call to parse the concept
-                                  pmConceptFormatFunc format ///< Function to call to format the concept
+                                  pmConceptFormatFunc format, ///< Function to call to format the concept
+                                  bool required ///< Is concept required?
                                  );
+
+/// Get whether a particular concept is required
+bool pmConceptGetRequired(const char *name, ///< Name of concept
+                          pmFPALevel level ///< Level at which concept resides
+    );
+
+/// Set whether a particular concept is required
+bool pmConceptSetRequired(const char *name, ///< Name of concept
+                          pmFPALevel level, ///< Level at which concept resides
+                          bool required ///< Whether concept is required or not
+    );
 
 /// Register a new concept for parsing and formatting
@@ -80,4 +93,5 @@
                        pmConceptParseFunc parse, ///< Function to call to parse the concept, or NULL
                        pmConceptFormatFunc format, ///< Function to call to format the concept, or NULL
+                       bool required,   ///< Is concept required?
                        pmFPALevel level ///< Level at which to store concept in the FPA hierarchy
                       );