Defines types and elements needed for the algebra operations of a peer. Forrest of xml. When the address is not specified NEWNODE installs this element as a lonely root. SEND can refer to a node in the document, instead of having a copy of it underneath TODO: it might be a better solution to incorporate XPointer for referencing, although we need only restricted subset of it SEND/RECEIVE can have multiple destinations. NEWNODE can have empty address. SEND: for telling the corresponding RECEIVE RECEIVE: for information about SEND, basically is ignored NEWNODE: ignored This element used in sc/ws-soap/receive declares the RECEIVE service call This element used in sc/ws-soap/send declares the SEND service call This element used in sc/ws-soap/newNode declares the NEWNODE service call