How to express application metadata for a JMS topic?

Hi there,
I would like to be able to provide application specific metadata associated with messages for an entire topic. I'd be interested in learning of methods to do this in a JMS way i.e. avoiding something implementation specific.
I'm using MapMessage objects to send XML payloads. The name in the name/value pair is the XML element name. An example pair name might be:
/j:FeatureCollection/@id... which means that the value of the name/value pair relates to the id attribute of the XML node named "j:FeatureCollection".
I'd like to be to associate metadata with my message so that I may declare the XML namespaces and schema locations.
One thought that I had was to use message properties e.g.:
message.setStringProperty(
"xmlns:j",
"http://www.classactionpl.com/gml/journeyFeatures");My concern though is that property information will be conveyed with each message sent and thus consume bandwidth, perhaps unnecessarily. Consumers are typically only going to be interested in the metadata at the start of the subscription to resolve XML namespace mappings.
Ideally, given that my metadata relates to information published on the topic as a whole, it'd be great to have the metadata associated with the topic instead. Can this be achieved?
FYI: I'm presently using ActiveMQ 4.1 and may also use IBM's Websphere MQ in the future.
Thanks for any help.
Kind regards,
Christopher

Thanks for your reply.
I really want to keep the metadata associated with the data. It seems like the properties of a message can help me here. I'm not sure that it is necessarily beyond the scope of JMS.
Any further thoughts?
Cheers,
-C

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