Infoset Model for SubscribeOp operation This specification defines a core set of properties, but it is also possible for other specifications to extend these and/or add other properties. The semantics and XML Infoset representation for any such extension properties will be described in their defining specifications. Subscribe Request has the following abstact properties: [event source]: wsa:[endpoint-reference] (1..1) [endto endpoint]: wsa:[endpoint-reference] (0..1) [expiry]: xsd:dateTime|xsd:duration (0..1) [filter]: wse:[filter expression] (0..1) [delivery]: wse:[delivery specification] (1..1) wse:[filter expression]has the following abstract properties: [dialect]: xsd:anyURI (0..1) [expression]: xsd:any (0..1) wse:[delivery specification] has the following abstract properties: [mode]: xsd:anyURI (0..1) [format]: xsd:anyURI (0..1) [event sink]: wsa:[endpoint-reference] (1..1) Subscribe Response has the following abstact properties: [subscription manager]: wsa:[endpoint-reference] (1..1) [expiry]: xsd:dateTime|xsd:duration (0..1)