1. A computer-implemented method for identifying a property of a data element, the method comprising: receiving a request for at least one sought property of a data element configured for use in semantically identifying information portions in electronic communications, the sought property to be valid in a context defined by at least one context value indicated by the request; 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; and generating an output in response to the request that indicates the at least one sought property.