The DVB-GBS group has recently completed the specification for the "Carriage and signalling of TV-Anytime information in DVB transport streams". One function this specification can support is the signalling of schedule data, mirroring the capabilities of the Event Information Tables defined in the existing DVB-SI specification. Although TV-Anytime uses a more complex data structure than DVB-SI there is a potential efficiency gain due to the combined use of Zlib compression and a binary format for XML called BiM. This Technical Note gives a quantitive comparison of the efficiency of the TV Anytime and DVB-SI approach, which may be useful when considering possible roles for the new specification.