FOUNDATION FOR INTELLIGENT PHYSICAL AGENTS

FIPA Cancel Communicative Act Specification

Document title	FIPA Cancel Communicative Act Specification
Document number	DC00041A	Document source	FIPA TC C
Document status	Deprecated	Date of this status	2000/10/16
Supersedes	None
Contact	fab@fipa.org
Change history
2000/10/16	Deprecated by FIPA00037

Geneva, Switzerland

Notice

Use of the technologies described in this specification may infringe patents, copyrights or other intellectual property rights of FIPA Members and non-members. Nothing in this specification should be construed as granting permission to use any of the technologies described. Anyone planning to make use of technology covered by the intellectual property rights of others should first obtain permission from the holder(s) of the rights. FIPA strongly encourages anyone implementing any part of this specification to determine first whether part(s) sought to be implemented are covered by the intellectual property of others, and, if so, to obtain appropriate licenses or other permission from the holder(s) of such intellectual property prior to implementation. This specification is subject to change without notice. Neither FIPA nor any of its Members accept any responsibility whatsoever for damages or liability, direct or consequential, which may result from the use of this specification.

Foreword

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Contents

1 Scope. 1

2 Cancel 2

3 References. 3

1 Scope

This document specifies the Cancel communicative act which is compliant to [FIPA00037] requirements.

2 Cancel

Summary	The action of cancelling some previously requested action (see [FIPA00057]) which has temporal extent, that is, it is not instantaneous.
Content	An action expression denoting the action to be cancelled.
Description	Cancel allows an agent to stop another agent from continuing to perform (or expecting to perform) an action which was previously requested. Note that the action that is the object of the act of cancellation should be believed by the sender to be ongoing or to be planned but not yet executed. In most interaction protocols, attempting to cancel an action that has already been performed should result in a refuse message (see [FIPA00055]) being sent back to the originator of the request.
Formal Model	<i, cancel(j, a)>º <i, disconfirm(j, I_i Done(a))> FP: ØI_i Done(a) Ù B_i (B_j I_i Done(a) Ú U_j I_i Done(a)) RE: B_j ØI_i Done(a) Cancel is the action of canceling any form of requested action. In other words, an agent i has requested an agent j to perform some action, possibly if some condition holds. This has the effect of i informing j that i has an intention. When i comes to drop its intention, it has to inform j that it no longer has this intention, that is, a disconfirm action (see [FIPA00044]).
Example	Agent j0 asks i to cancel a previous request-when act (see [FIPA00058]) by quoting the action: (cancel :sender j0 :receiver i :content (request-when :sender j …))

3 References

[FIPA00037] FIPA Communicative Act Library Specification. Foundation for Intelligent Physical Agents, 2000. http://www.fipa.org/specs/fipa00037/

[FIPA00044] FIPA Disconfirm Communicative Act Specification. Foundation for Intelligent Physical Agents, 2000. http://www.fipa.org/specs/fipa00044/

[FIPA00055] FIPA Refuse Communicative Act Specification. Foundation for Intelligent Physical Agents, 2000. http://www.fipa.org/specs/fipa00055/

[FIPA00057] FIPA Request Communicative Act Specification. Foundation for Intelligent Physical Agents, 2000. http://www.fipa.org/specs/fipa00057/

[FIPA00058] FIPA Request When Communicative Act Specification. Foundation for Intelligent Physical Agents, 2000. http://www.fipa.org/specs/fipa00058/