A.2 Metamodel for UML 2.0/2.1

Attribute	Type	Multi.	Description
context	ref	one	Owner of the element in the UML model.
id	data	one	Unique identifier of the model element.
name	data	one	Name of the element in UML model.
comments	ref	many	The comments for the model element.

Table 8: Default attributes for the UML2.0/2.1 metamodel

Table 9 lists all elements of the UML2.0/2.1 metamodel, and their attributes in addition to those in Table 8.

Model Element	Attribute	Type	Multi.	Description
abstraction	supplier	ref	many	Links to the supplier elements of the relationship.
	client	ref	many	Links to the client elements of the relationship.
action	kind	data	one	The kind of action: send, return, create, etc (there are many).
	inputs	ref	many	The input pins of the action.
	outputs	ref	many	The output pins of the action.
	handlers	ref	many	The exception handlers owned by the action.
activity	nodes	ref	many	The action, control, and object nodes of the activity.
	edges	ref	many	The control and object flows of the activity.
	groups	ref	many	The groups of the activity.
activitygroup	edges	ref	many	The contained edges of the group.
	nodes	ref	many	The contained nodes of the group.
	groups	ref	many	The subgroups of the group.
	handlers	ref	many	The exception handlers of the structured node group.
	pins	ref	many	Pins owned by the activity group.
	kind	data	one	The kind of group: partition, interruptible, expansion, structured, conditional, loop, sequence.
actor	visibility	data	one	Visibility of the element (public, protected, package, private).
	abstract	data	one	Boolean indicating if the element is abstract.
	leaf	data	one	Boolean indicating if the element can have specializations.
	ownedattributes	ref	many	The attributes of the element.
	ownedoperations	ref	many	The operations of the element.
	ownedports	ref	many	The ports of the element.
	nestedclassifiers	ref	many	The nested classifiers of the element.
	generalizations	ref	many	The generalizations owned by the element.
	interfacerealizations	ref	many	The interface realizations owned by the element.
	connectors	ref	many	The connectors owned by the element.
artifact	visibility	data	one	Visibility of the element (public, protected, package, private).
	abstract	data	one	Boolean indicating if the element is abstract.
	leaf	data	one	Boolean indicating if the element can have specializations.
	ownedattributes	ref	many	The attributes of the element.
	ownedoperations	ref	many	The operations of the element.
	ownedports	ref	many	The ports of the element.
	nestedclassifiers	ref	many	The nested classifiers of the element.
	generalizations	ref	many	The generalizations owned by the element.
	interfacerealizations	ref	many	The interface realizations owned by the element.
	connectors	ref	many	The connectors owned by the element.
	nestedartifacts	ref	many	The artifacts that are defined (nested) within the artifact.
	manifestations	ref	many	The manifestation links to the model elements that are manifested in the artifact.
association	memberends	ref	many	The member ends of the association.
	ownedends	ref	many	The owned ends of the association (not navigable association ends).
	generalizations	ref	many	The generalizations owned by the association.
associationclass	memberends	ref	many	The member ends of the association.
	ownedends	ref	many	The owned ends of the association (not navigable association ends).
	generalizations	ref	many	The generalizations owned by the association.
class	visibility	data	one	Visibility of the element (public, protected, package, private).
	abstract	data	one	Boolean indicating if the element is abstract.
	leaf	data	one	Boolean indicating if the element can have specializations.
	ownedattributes	ref	many	The attributes of the element.
	ownedoperations	ref	many	The operations of the element.
	ownedports	ref	many	The ports of the element.
	nestedclassifiers	ref	many	The nested classifiers of the element.
	generalizations	ref	many	The generalizations owned by the element.
	interfacerealizations	ref	many	The interface realizations owned by the element.
	connectors	ref	many	The connectors owned by the element.
collaboration	visibility	data	one	Visibility of the element (public, protected, package, private).
	abstract	data	one	Boolean indicating if the element is abstract.
	leaf	data	one	Boolean indicating if the element can have specializations.
	ownedattributes	ref	many	The attributes of the element.
	ownedoperations	ref	many	The operations of the element.
	ownedports	ref	many	The ports of the element.
	nestedclassifiers	ref	many	The nested classifiers of the element.
	generalizations	ref	many	The generalizations owned by the element.
	interfacerealizations	ref	many	The interface realizations owned by the element.
	connectors	ref	many	The connectors owned by the element.
	ownedbehaviors	ref	many	Behavior specifications owned by the collaboration.
combinedfragment	operator	data	one	The interaction operator (alt, loop, break, opt, par, ref, etc.)
	covered	ref	many	The lifelines covered by this combined fragment.
	operands	ref	many	The interaction operands of this combined fragment.
comment	body	data	one	The comment text.
component	visibility	data	one	Visibility of the element (public, protected, package, private).
	abstract	data	one	Boolean indicating if the element is abstract.
	leaf	data	one	Boolean indicating if the element can have specializations.
	ownedattributes	ref	many	The attributes of the element.
	ownedoperations	ref	many	The operations of the element.
	ownedports	ref	many	The ports of the element.
	nestedclassifiers	ref	many	The nested classifiers of the element.
	generalizations	ref	many	The generalizations owned by the element.
	interfacerealizations	ref	many	The interface realizations owned by the element.
	connectors	ref	many	The connectors owned by the element.
	realizations	ref	many	The realizations owned by the component.
	members	ref	many	Other members owned by the component.
connector	ends	ref	many	The connector ends of the connector.
connectorend	role	ref	one	The element that is attached at this connector end.
constraint	---	---	---
controlflow	source	ref	one	Source of the control flow.
	target	ref	one	Target of the control flow.
	guard	ref	one	Guard of the control flow.
controlnode	kind	data	one	The kind of control node: initial, activityfinal, flowfinal, fork, join, merge, or decision.
datatype	ownedattributes	ref	many	The attributes of the element.
	ownedoperations	ref	many	The operations of the element.
	generalizations	ref	many	The generalizations owned by the element.
dependency	supplier	ref	many	Links to the supplier elements of the relationship.
	client	ref	many	Links to the client elements of the relationship.
deployment	supplier	ref	many	Links to the supplier elements of the relationship.
	client	ref	many	Links to the client elements of the relationship.
	configurations	ref	many	The deployment specifications that parameterize the deployment.
deploymentspec	visibility	data	one	Visibility of the element (public, protected, package, private).
	abstract	data	one	Boolean indicating if the element is abstract.
	leaf	data	one	Boolean indicating if the element can have specializations.
	ownedattributes	ref	many	The attributes of the element.
	ownedoperations	ref	many	The operations of the element.
	ownedports	ref	many	The ports of the element.
	nestedclassifiers	ref	many	The nested classifiers of the element.
	generalizations	ref	many	The generalizations owned by the element.
	interfacerealizations	ref	many	The interface realizations owned by the element.
	connectors	ref	many	The connectors owned by the element.
	nestedartifacts	ref	many	The artifacts that are defined (nested) within the artifact.
	manifestations	ref	many	The manifestation links to the model elements that are manifested in the artifact.
diagram	type	data	one	The type of diagram (class diagram, sequence diagram, etc).
diagramelement	element	ref	one	The element that is shown on the diagram.
enumeration	ownedattributes	ref	many	The attributes of the element.
	ownedoperations	ref	many	The operations of the element.
	generalizations	ref	many	The generalizations owned by the element.
	ownedliterals	ref	many	The literals of the enumeration.
enumerationliteral	---	---	---
event	kind	data	one	The kind of event (signal, call, change, time, anyreceive).
	linkedeventelement	ref	one	The element (signal, operation, boolean expression, or deadline) that raised the event, if any.
exceptionhandler	handlerbody	ref	one	The node that handles the exception.
	exceptioninput	ref	one	The input node of the handler body that received the exception token.
expression	---	---	---
extensionpoint	---	---	---
generalization	general	ref	one	Link to the parent in the generalization.
instancespecification	classifier	ref	many	Links to the classifiers that this entity is an instance of.
	deployments	ref	many	The deployments where this instance specification is the target.
instancevalue	---	---	---
interaction	visibility	data	one	Visibility of the element (public, protected, package, private).
	abstract	data	one	Boolean indicating if the element is abstract.
	leaf	data	one	Boolean indicating if the element can have specializations.
	ownedattributes	ref	many	The attributes of the element.
	ownedoperations	ref	many	The operations of the element.
	ownedports	ref	many	The ports of the element.
	nestedclassifiers	ref	many	The nested classifiers of the element.
	generalizations	ref	many	The generalizations owned by the element.
	interfacerealizations	ref	many	The interface realizations owned by the element.
	connectors	ref	many	The connectors owned by the element.
	lifelines	ref	many	The lifelines involved in the interaction.
	messages	ref	many	The messages sent within the interaction.
	fragments	ref	many	The message occurrence specifications and combined fragments of the interaction.
interactionoperand	fragments	ref	many	The message occurrence specifications and combined fragments of the interaction operand.
interface	ownedattributes	ref	many	The attributes of the interface.
	ownedoperations	ref	many	The operations of the interface.
	nestedclassifiers	ref	many	The nested classifiers of the interface.
	generalizations	ref	many	The generalizations owned by the interface.
interfacerealization	contract	ref	one	Link to the realized interface.
lifeline	represents	ref	one	The interaction participant that this lifeline represents.
literalboolean	---	---	---
literalinteger	---	---	---
literalnull	---	---	---
literalstring	---	---	---
literalunlimitednatural	---	---	---
manifestation	supplier	ref	many	Links to the supplier elements of the relationship.
	client	ref	many	Links to the client elements of the relationship.
message	receiveevent	ref	one	Occurrence specification for the message reception.
	sendevent	ref	one	Occurrence specification for the message sending.
	sort	data	one	The sort of communication (synchCall, asynchCall, asynchSignal).
method	---	---	---
model	ownedmembers	ref	many	The owned member elements.
node	visibility	data	one	Visibility of the element (public, protected, package, private).
	abstract	data	one	Boolean indicating if the element is abstract.
	leaf	data	one	Boolean indicating if the element can have specializations.
	ownedattributes	ref	many	The attributes of the element.
	ownedoperations	ref	many	The operations of the element.
	ownedports	ref	many	The ports of the element.
	nestedclassifiers	ref	many	The nested classifiers of the element.
	generalizations	ref	many	The generalizations owned by the element.
	interfacerealizations	ref	many	The interface realizations owned by the element.
	connectors	ref	many	The connectors owned by the element.
	nestednodes	ref	many	The subnodes located on the node.
	deployments	ref	many	The deployment links owned by the node (=deployment location).
	kind	data	one	The type of node (regular, executionenvironment, device)
objectflow	source	ref	one	Source of the object flow.
	target	ref	one	Target of the object flow.
	guard	ref	one	Guard of the control flow.
objectnode	kind	data	one	The kind of object node: centralbuffer, datastore, activityparameter, or expansion.
occurrencespec	covered	ref	one	The lifeline on which this occurrence specification appears.
	event	ref	one	The occurring event.
opaqueexpression	---	---	---
operation	visibility	data	one	Visibility of the operation (public, private, protected, package).
	abstract	data	one	Boolean indicating if operation is abstract.
	isquery	data	one	Boolean indicating if operation is a query that does not change the classifier's state.
	ownedparameters	ref	many	The parameters of the operation.
package	ownedmembers	ref	many	The owned member elements.
parameter	kind	data	one	The direction of the parameter: in (default), out, inout, return.
	parametertype	ref	one	Reference to the parameter type (class, data type etc).
pin	kind	data	one	The kind of pin (input, output, value, actioninput).
	type	ref	one	The type of the pin.
port	type	ref	one	Reference to the type of the port.
primitivetype	ownedattributes	ref	many	The attributes of the element.
	ownedoperations	ref	many	The operations of the element.
	generalizations	ref	many	The generalizations owned by the element.
property	visibility	data	one	Visibility of the feature (public, private, protected, package).
	propertytype	ref	one	Reference to the feature type (class, data type etc).
	isreadonly	data	one	Changeability of the feature. Values: true, false (default if not specified).
	association	ref	one	Reference to association if this is an association end.
	aggregation	data	one	The aggregation kind of the property: shared, composite, or none (default).
	qualifiers	ref	many	The qualifier attributes of the property.
realization	supplier	ref	many	Links to the supplier elements of the relationship.
	client	ref	many	Links to the client elements of the relationship.
region	subvertices	ref	many	The states contained in the region.
	transitions	ref	many	The transitions contained in the region.
signal	---	---	---
state	kind	data	one	The kind of state: '' (empty), final, initial, deepHistory, shallowHistory, join, fork, choice, junction, entryPoint, exitPoint, terminate.
	regions	ref	many	The regions of the composite or concurrent state.
	entry	ref	many	The entry activities of the state.
	exit	ref	many	The exit activities of the state.
	doactivity	ref	many	The do-activities of the state.
	connectionpoints	ref	many	The connection points of the state.
statemachine	regions	ref	many	The top-level regions owned by the state machine.
	isprotocol	data	one	Boolean indicating if this is a protocol state machine
	connectionpoints	ref	many	The connection points of the state machine.
stereotype	---	---	---
substitution	supplier	ref	many	Links to the supplier elements of the relationship.
	client	ref	many	Links to the client elements of the relationship.
transition	kind	data	one	The kind of transition: external, internal, or local.
	isprotocol	data	one	Boolean indicating if this is a protocol transition.
	transsource	ref	one	The source state of the transition.
	transtarget	ref	one	The target state of the transition.
	triggers	ref	many	The triggers that may fire the transition.
	guard	ref	one	The guard of the transition.
	effect	ref	one	The activity to be performed when the transition fires.
trigger	event	ref	one	The event causing the trigger.
usage	supplier	ref	many	Links to the supplier elements of the relationship.
	client	ref	many	Links to the client elements of the relationship.
usecase	visibility	data	one	Visibility of the element (public, protected, package, private).
	abstract	data	one	Boolean indicating if the element is abstract.
	leaf	data	one	Boolean indicating if the element can have specializations.
	ownedattributes	ref	many	The attributes of the element.
	ownedoperations	ref	many	The operations of the element.
	ownedports	ref	many	The ports of the element.
	nestedclassifiers	ref	many	The nested classifiers of the element.
	generalizations	ref	many	The generalizations owned by the element.
	interfacerealizations	ref	many	The interface realizations owned by the element.
	connectors	ref	many	The connectors owned by the element.
	includes	ref	many	The include relationships owned by the use case.
	extends	ref	many	The extend relationships owned by the use case.
	extensionpoints	ref	many	The extension points owned by the use case.
usecaseextend	extendedcase	ref	one	The use case that is extended.
	usecaseextensionpoint	ref	one	The extension point in the extended use case.
usecaseinclude	usecaseaddition	ref	one	The included use case.

Table 9: SDMetrics metamodel elements and attributes for UML2.0/2.1 models