It is possible to map more than one CAD property to a UDA or a production input. This handles the situation where more than one CAD property for the same attribute exists and is populated in the CAD file. For example, a company's use of CAD properties might evolve over time, so that different properties may be present in parts of different ages or from different organizations within the company. Or, the CAD file may specify both a "Material" and an "Alternate Material" field. Precedence in aPriori is determined by the order in which the mappings occur in the XML file: the first mapping that succeeds "wins".