A system and a method including accessing a semantic model having a grammar syntax supporting an expression including a combination of at least one of a semantic model class and an instance of a semantic model class; specifying at least one missing property specification for at least one of a semantic model class and an instance of a semantic model class, including constraints for a use of the at least one missing property; adding the at least one missing property specification to the semantic model, the at least one missing property specification added to the semantic model to be referenced in a validation and translation of an expression including a combination of at least one of the class and the instance of a class having one of the at least one missing property specified therewith; and generating a record of the semantic model including the at least one missing property specification added thereto.