Methods and computer program products relating to properties of data elements. A computer-implemented method for identifying a property of a data element includes receiving a request for at least one sought property of a data element. The data element is configured for use in semantically identifying information portions in electronic communications. The sought property is to be valid in a context defined by at least one context value indicated by the request. The method includes identifying the at least one sought property by evaluating at least one logical rule that defines at least one property of the data element as being valid for a specified context. The method includes generating an output in response to the request that indicates the at least one sought property.