Computer system, data communication network, computer program and data carrier, all for filtering a received message comprising mark-up language content

摘要

A method for filtering data in a network, at least including: determining (I) a content type of data, and if said content type is one of a number of predetermined content types: determining a content syntax (II) of said data; determining (III) a content semantics of said data; checking said content syntax against a predetermined set of syntax rules corresponding to said predetermined content type; and checking (IV) said content syntax against a predetermined set of semantic rules corresponding to said predetermined content type; and if said content syntax and said content semantics do satisfy said predetermined rules: processing (V) said data further, or else discarding said data.