- The parser checks whether all cross-references that are used are defined
-(if not, an error is produced) and whether all cross-references that are defined
-are used (if not, a warning is produced). It also checks whether the
-type of the cross-reference is the same on definition and use (if not, an
-error is produced).<br>
+ The parser checks whether all cross-references that are used are defined
+ (if not, an error is produced) and whether all cross-references that are
+defined are used (if not, a warning is produced). It also checks whether
+the type of the cross-reference is the same on definition and use (if not,
+an error is produced). The first two checks are done at the end of
+the parsing, because cross-references can be defined after their usage in
+GEDCOM.<br>