FOUNDATION FOR INTELLIGENT PHYSICAL AGENTS

FIPA Not Understood Communicative Act Specification

Document title	FIPA Not Understood Communicative Act Specification
Document number	DC00049A	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 Not Understood. 2

3 References. 3

1 Scope

This document specifies the Not Understood communicative act which is compliant to [FIPA00037] requirements.

2 Not Understood

Summary	The sender of the act (for example, i) informs the receiver (for example, j) that it perceived that j performed some action, but that i did not understand what j just did. A particular common case is that i tells j that i did not understand the message that j has just sent to i.
Content	A tuple consisting of an action or event, for example, a communicative act, and an explanatory reason.
Description	The sender received a communicative act which it did not understand. There may be several reasons for this: the agent may not have been designed to process a certain act or class of acts, or it may have been expecting a different message. For example, it may have been strictly following a pre-defined protocol, in which the possible message sequences are predetermined. The not-understood message indicates to that the sender of the original (misunderstood) action that nothing has been done as a result of the message. This act may also be used in the general case for i to inform j that it has not understood j’s action. The second term of the content tuple is a proposition representing the reason for the failure to understand. Note: It is not possible to fully capture the intended semantics of an action not being understood by another agent. The characterization below captures that an event happened and that the recipient of the not-understood message was the agent of that event. Additionally, because it is possible that f (the reason for failure) is not a well-formed formula, f cannot be part of the semantic characterization.
Formal Model	<i, not-understood(j, a, f)>º <i, Inform( j, a > FP: B_i a Ù ØB_i (Bif_j a Ú Uif_j a) RE: B_j a Where: a = f Ù ($x) B_i ((ie Done(e) Ù Agent(e, j) Ù B_j(Done(e) Ù Agent(e, j) Ù (a = e))) = x).
Example	Agent i did not understand a query-if message (see [FIPA00053]) because it did not recognize the ontology. (not-understood :sender i :receiver j :content ((query-if :sender j :receiver i …) (unknown (ontology www))) :language FIPA-SL)

3 References

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

[FIPA00053] FIPA Query If Communicative Act Specification. Foundation for Intelligent Physical Agents, 2000. http://www.fipa.org/specs/fipa00053/