Mapping XML to existing OWL ontologies

Paging system comprising a transmitter and one or more paging receivers, where said transmitter may transmit a communication comprising a first data block to all receivers. Each receiver comprises a first memory comprising up to five registers for storing therein component data blocks of said first data block, of which a second component representing a receiver address or select code in register, a third component, possibly composed of fifth and sixth subcomponents representing a message code and a message identification code in registers respectively, a fourth component representing a control code in register, and a seventh component representing an alternative message identification code in register 18. In a second memory of said receiver a plurality of third data blocks may be stored in a corresponding plurality of memory locations, the message code in which may be displayed and each of which may be erased if, depending on the value of the control code, the message code and/or the identification code thereof in first memory is identical to the corresponding contents of the location, which, in case of equality, may be written then with a new third data block, of which the message identification code may be the alternative message identification code.