For alleviating the error-prone and inefficient process of reentering tolerance analysis specification manually and enabling the tolerance analysis system to understand semantics from upstream product design information,an approach interpreting Geometric Dimension & Tolerance(GD&T)semantic information for tolerance analysis was proposed.The GD&T information that needed to be interpreted was categorized,and the neutral-file-based EXPRESS models were developed.The Web Ontology Language(OWL 2)was used to map t...