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Service publishers submit 'offers' to the Trader.
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Each offer includes the service type, a set of properties (which are service type dependent), and a handle to the object class, representing the advertised service.
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Service consumers/subscribers search for objects that match their requirements using a 'constraint language'.
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One such language is defined as part of the Trader specification.
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Other dedicated scripts can be also supported by dynamical binding of associated interpreters.
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The Default constraint language specifies queries in terms of the service properties, connected/related via the standard set of mathematical, boolean and set-theoretical unary or binary operators.
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