15. A method to be performed in a process of a user modeling a data element, the method comprising: receiving a first user input made under guidance of a modeling tool in a graphical user interface (GUI), the input selecting one of several predefined data elements configured for use by a sender system in identifying information portions in electronic communications such that the information portions are automatically displayed and used by a receiver system to interpret contents of the electronic communications, each of the data elements being associated with semantic information indicating their definition and intended use, the receiver system using the semantic information to display and interpret the electronic communications, wherein the data elements identify corresponding ones of the information portions according to the semantic information; presenting, in the GUI and in response to the first user input, a representation of the selected predefined data element, the representation containing the semantic information; and modifying at least one aspect of the semantic information of the predefined data element and not the information portions based on a second user input made under guidance of the modeling tool, wherein the predefined data element associated with the modified semantic information is stored in a repository and accessed there by the receiver system.
15. A method to be performed in a process of a user modeling a data element, the method comprising: receiving a first user input made under guidance of a modeling tool in a graphical user interface (GUI), the input selecting one of several predefined data elements configured for use by a sender system in identifying information portions in electronic communications such that the information portions are automatically displayed and used by a receiver system to interpret contents of the electronic communications, each of the data elements being associated with semantic information indicating their definition and intended use, the receiver system using the semantic information to display and interpret the electronic communications, wherein the data elements identify corresponding ones of the information portions according to the semantic information; presenting, in the GUI and in response to the first user input, a representation of the selected predefined data element, the representation containing the semantic information; and modifying at least one aspect of the semantic information of the predefined data element and not the information portions based on a second user input made under guidance of the modeling tool, wherein the predefined data element associated with the modified semantic information is stored in a repository and accessed there by the receiver system. 16. The method of claim 15 , wherein the modification comprises adding another data element to a group of data elements that make up the selected data element.