Introduction

For complex intent, such as the intent of cloud leased line, it is necessary to decompose the complex intent into sub intents of different dimensions, and implement the user's original intent through the execution of sub intents. So we need to deal with machin-machine intent, and for different intents or sub intents in the system, it is necessary to provide general intent model to ensure that all intents(especially machine-machine intents) operate according to the same expression.

For detailed requirement information, see the following links: REQ-1267: General intent model and general intent interface requirements in R11Done

Benefits of introducing general intent model in ONAP

Improve interoperability between components/systems via standarded intent description.
Model federation mechanism is introduced (later explained in detail) to enable domain extension.
Based on the general intent model, the machine-machine intent is supported.
Enhance standardization based on the existing standards.
Reuse the existing domain related models which enables extension to different application scenarios.

Intent model organization form

Intent Information Element

Attribute	Qualifier	Cardinality	Content	Description
intentId	M	1	String	The identifier of this intent.
intentName	M	1	String	It describes the name of the intent.
intentExpectations	M	1..N	IntentExpectation	Multiple expectation lists contained in one intent.
intentContexts	O	1..N	Context	It describes the list of IntentContext(s) which represents the constraints and conditions that should apply for the entire intent.
intentFulfilmentinfo	O	1	FulfilmentInfo	It describes status of fulfilment of an intent and the related reasons for that status.

IntentExpectation Information Element

Attribute	Qualifier	Cardinality	Content	Description
expectationId	M	1	String	The identifier of this expectation.
expectationName	M	1	String	It describes the name of the expectation.
expectationType	O	1	ENUM	It describes the characteristic of the intentExpectation and is the property that describes the types of intentExpectations. Value: Delivery Assurance
expectationObject	O	1	ExpectationObject	Represents the Object of the IntentExpectation that are required to be applied on.
expectationTargets	M	1..N	ExpectationTarget	It describes the list of ExpectationTarget(s) which represent specific outcomes on the metrics that characterize the performance of the object(s) or some abstract index that expresses the behavior of the object(s) that are desired to be realized for a given intentExpectation.
expectationContexts	O	1..N	Context	It describes the list of context(s) which represents the constraints and conditions that should apply for a specific intentExpectation.
expectationfulfilmentInfo	O	1	FulfilmentInfo	It describes status of fulfilment of an intentExpectation and the related reasons for that status.

ExpectationObject Information Element

Attribute	Qualifier	Cardinality	Content	Description
objectType	CM	1	ENUM	It describes the type of expectation object of the IntentExpectation that are required to be applied on. It can be class name of the managed object. Condition: The intent expectation is not for a specific object instance or intent owner have no knowledge of the MOI of this specific object instance. Value: Relevant to the specific scenario of Intent Expectation
objectInstance	CM	1	String	It describes a specific object instance (e.g. instance of managed object) to which the intentExpectation should apply. Condition: The intent expectation is for a specific object instance and intent owner have the knowledge of the MOI of this specific object instance.
objectContexts	O	1..N	Context	It describes the list of ObjectContext(s) which represents the constraints and conditions to be used as filter information to identify the object(s) to which a given intentExpectation should apply.

ExpectationTarget Information Element

Attribute	Qualifier	Cardinality	Content	Description
targetId	M	1	String	The identifier of this target.
targetName	M	1	String	It describes the name of the expectation target.
targetConditions	M	1..N	Condition	It represents the conditions that the expectation target needs to meet.
targetContexts	O	1..N	Context	It describes the list of constraints and conditions that should apply for a specific expectationTarget.
targetFulfilmentInfo	O	1	FulfilmentInfo	It describes status of fulfilment of an expectationTarget and the related reasons for that status.

Condition Information Element

Attribute	Qualifier	Cardinality	Content	Description
conditionId	M	1	String	The identifier of this condition.
conditionName	M	1	String	It describes the name of the condition.
operator	M	1	Enum	If conditionValue exists, represents the specific requirements for condition. Value: lgreater than equal to less than not equal to one of some of maximum value minimum value median credibility If conditionList exists, representing the relationship between all conditions. Value: and or
conditionValue	CM	1	String	If it is a simlpe condition, represents the specific value of the condition.
conditionList	CM	1..N	Condition	If it is a composite condition, represents a group of conditions.

Context Information Element

Attribute	Qualifier	Cardinality	Content	Description
contextId	M	1	String	The identifier of this context.
contextName	M	1	String	It describes the name of the context.
contextConditions	M	1..N	Condition	It represents the conditions that the context needs to meet.

FulfilmentInfo Information Element

Attribute	Qualifier	Cardinality	Content	Description
fulfilmentStatus	M	1	ENUM	It describes the current status of the fulfilment result. Value: FULFILLED NOT_FULFILLED
notFulfilledState	CM	1	ENUM	It describes the current progress of or the reason for not achieving fulfilment for the intent, intentExpectation or expectationTarget. Value: ACKNOWLEDGED COMPLIANT DEGRADED SUSPENDED TERMINATED FULFILMENTFAILED
notFulfilledReasons	CO	1	String	It describes the reasons/observations related to the specific noted notFulfilledState.

Additional information

This model refers to the existing intent model information in 3GPP TS 28.312 V17.0.1 and TMF TR290 Intent Common Model v2.1.0.