A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

A accept event action is an action that waits for the occurrence of an event meeting specified conditions.

An accept call action is an accept event action representing the receipt of a synchronous call request. In addition to the normal operation parameters, the action produces an output that is needed later to supply the information to the reply action necessary to return control to the caller. This action is for synchronous calls. If it is used to handle an asynchronous call, execution of the subsequent reply action will complete immediately with no effects.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

A accept event action is an action that waits for the occurrence of an event meeting specified conditions.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

A read structural feature action is a structural feature action that retrieves the values of a structural feature.

A read structural feature action is a structural feature action that retrieves the values of a structural feature.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

An add structural feature value action is a write structural feature action for adding values to a structural feature.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

A remove variable value action is a write variable action that removes values from variables.

WriteVariableAction is an abstract class for variable actions that change variable values.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

An add variable value action is a write variable action for adding values to a variable.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

InvocationAction is an abstract class for the various actions that invoke behavior. In addition to targeting an object, invocation actions can also invoke behavioral features on ports from where the invocation requests are routed onwards on links deriving from attached connectors. Invocation actions may also be sent to a target via a given port, either on the sending object or on another object.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

A broadcast signal action is an action that transmits a signal instance to all the potential target objects in the system, which may cause the firing of a state machine transitions or the execution of associated activities of a target object. The argument values are available to the execution of associated behaviors. The requestor continues execution immediately after the signals are sent out. It does not wait for receipt. Any reply messages are ignored and are not transmitted to the requestor.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

InvocationAction is an abstract class for the various actions that invoke behavior. In addition to targeting an object, invocation actions can also invoke behavioral features on ports from where the invocation requests are routed onwards on links deriving from attached connectors. Invocation actions may also be sent to a target via a given port, either on the sending object or on another object.

CallAction is an abstract class for actions that invoke behavior and receive return values.

A call behavior action is a call action that invokes a behavior directly rather than invoking a behavioral feature that, in turn, results in the invocation of that behavior. The argument values of the action are available to the execution of the invoked behavior. For synchronous calls the execution of the call behavior action waits until the execution of the invoked behavior completes and a result is returned on its output pin. The action completes immediately without a result, if the call is asynchronous. In particular, the invoked behavior may be an activity.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

InvocationAction is an abstract class for the various actions that invoke behavior. In addition to targeting an object, invocation actions can also invoke behavioral features on ports from where the invocation requests are routed onwards on links deriving from attached connectors. Invocation actions may also be sent to a target via a given port, either on the sending object or on another object.

CallAction is an abstract class for actions that invoke behavior and receive return values.

A call operation action is an action that transmits an operation call request to the target object, where it may cause the invocation of associated behavior. The argument values of the action are available to the execution of the invoked behavior. If the action is marked synchronous, the execution of the call operation action waits until the execution of the invoked behavior completes and a reply transmission is returned to the caller; otherwise execution of the action is complete when the invocation of the operation is established and the execution of the invoked operation proceeds concurrently with the execution of the calling behavior. Any values returned as part of the reply transmission are put on the result output pins of the call operation action. Upon receipt of the reply transmission, execution of the call operation action is complete.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

A clear association action is an action that destroys all links of an association in which a particular object participates.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

A read structural feature action is a structural feature action that retrieves the values of a structural feature.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

A clear structural feature action is a structural feature action that removes all values of a structural feature.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

A remove variable value action is a write variable action that removes values from variables.

A clear variable action is a variable action that removes all values of a variable.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

A structured activity node is an executable activity node that may have an expansion into subordinate nodes as an activity group. The subordinate nodes must belong to only one structured activity node, although they may be nested. Because of the concurrent nature of the execution of actions within and across activities, it can be difficult to guarantee the consistent access and modification of object memory. In order to avoid race conditions or other concurrency-related problems, it is sometimes necessary to isolate the effects of a group of actions from the effects of actions outside the group. This may be indicated by setting the mustIsolate attribute to true on a structured activity node. If a structured activity node is "isolated," then any object used by an action within the node cannot be accessed by any action outside the node until the structured activity node as a whole completes. Any concurrent actions that would result in accessing such objects are required to have their execution deferred until the completion of the node.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

A conditional node is a structured activity node that represents an exclusive choice among some number of alternatives.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

A read link action is a link action that navigates across associations to retrieve objects on one end.

WriteLinkAction is an abstract class for link actions that create and destroy links.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

A create link action is a write link action for creating links.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

A read link action is a link action that navigates across associations to retrieve objects on one end.

WriteLinkAction is an abstract class for link actions that create and destroy links.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

A create link object action creates a link object.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

A create object action is an action that creates an object that conforms to a statically specified classifier and puts it on an output pin at runtime.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

A read link action is a link action that navigates across associations to retrieve objects on one end.

WriteLinkAction is an abstract class for link actions that create and destroy links.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

A destroy link action is a write link action that destroys links and link objects.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

A destroy object action is an action that destroys objects.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

A structured activity node is an executable activity node that may have an expansion into subordinate nodes as an activity group. The subordinate nodes must belong to only one structured activity node, although they may be nested. Because of the concurrent nature of the execution of actions within and across activities, it can be difficult to guarantee the consistent access and modification of object memory. In order to avoid race conditions or other concurrency-related problems, it is sometimes necessary to isolate the effects of a group of actions from the effects of actions outside the group. This may be indicated by setting the mustIsolate attribute to true on a structured activity node. If a structured activity node is "isolated," then any object used by an action within the node cannot be accessed by any action outside the node until the structured activity node as a whole completes. Any concurrent actions that would result in accessing such objects are required to have their execution deferred until the completion of the node.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

An expansion region is a structured activity region that executes multiple times corresponding to elements of an input collection.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

A structured activity node is an executable activity node that may have an expansion into subordinate nodes as an activity group. The subordinate nodes must belong to only one structured activity node, although they may be nested. Because of the concurrent nature of the execution of actions within and across activities, it can be difficult to guarantee the consistent access and modification of object memory. In order to avoid race conditions or other concurrency-related problems, it is sometimes necessary to isolate the effects of a group of actions from the effects of actions outside the group. This may be indicated by setting the mustIsolate attribute to true on a structured activity node. If a structured activity node is "isolated," then any object used by an action within the node cannot be accessed by any action outside the node until the structured activity node as a whole completes. Any concurrent actions that would result in accessing such objects are required to have their execution deferred until the completion of the node.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

A loop node is a structured activity node that represents a loop with setup, test, and body sections.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

An opaque action is an action with implementation-specific semantics.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

A raise exception action is an action that causes an exception to occur. The input value becomes the exception object.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

A read extent action is an action that retrieves the current instances of a classifier.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

A read is classified object action is an action that determines whether a runtime object is classified by a given classifier.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

A read link action is a link action that navigates across associations to retrieve objects on one end.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

A read link action is a link action that navigates across associations to retrieve objects on one end.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

A read link object end action is an action that retrieves an end object from a link object.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

A read link object end qualifier action is an action that retrieves a qualifier end value from a link object.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

A read self action is an action that retrieves the host object of an action.

The following features are supported:

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

A read structural feature action is a structural feature action that retrieves the values of a structural feature.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

A read structural feature action is a structural feature action that retrieves the values of a structural feature.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

A remove variable value action is a write variable action that removes values from variables.

A read variable action is a variable action that retrieves the values of a variable.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

A reclassify object action is an action that changes which classifiers classify an object.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

A reduce action is an action that reduces a collection to a single value by combining the elements of the collection.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

A read structural feature action is a structural feature action that retrieves the values of a structural feature.

A read structural feature action is a structural feature action that retrieves the values of a structural feature.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

A remove structural feature value action is a write structural feature action that removes values from structural features.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

A remove variable value action is a write variable action that removes values from variables.

WriteVariableAction is an abstract class for variable actions that change variable values.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

A remove variable value action is a write variable action that removes values from variables.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

A reply action is an action that accepts a set of return values and a value containing return information produced by a previous accept call action. The reply action returns the values to the caller of the previous call, completing execution of the call.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

InvocationAction is an abstract class for the various actions that invoke behavior. In addition to targeting an object, invocation actions can also invoke behavioral features on ports from where the invocation requests are routed onwards on links deriving from attached connectors. Invocation actions may also be sent to a target via a given port, either on the sending object or on another object.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

A send object action is an action that transmits an object to the target object, where it may invoke behavior such as the firing of state machine transitions or the execution of an activity. The value of the object is available to the execution of invoked behaviors. The requestor continues execution immediately. Any reply message is ignored and is not transmitted to the requestor.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

InvocationAction is an abstract class for the various actions that invoke behavior. In addition to targeting an object, invocation actions can also invoke behavioral features on ports from where the invocation requests are routed onwards on links deriving from attached connectors. Invocation actions may also be sent to a target via a given port, either on the sending object or on another object.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

A send signal action is an action that creates a signal instance from its inputs, and transmits it to the target object, where it may cause the firing of a state machine transition or the execution of an activity. The argument values are available to the execution of associated behaviors. The requestor continues execution immediately. Any reply message is ignored and is not transmitted to the requestor. If the input is already a signal instance, use a send object action.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

A structured activity node is an executable activity node that may have an expansion into subordinate nodes as an activity group. The subordinate nodes must belong to only one structured activity node, although they may be nested. Because of the concurrent nature of the execution of actions within and across activities, it can be difficult to guarantee the consistent access and modification of object memory. In order to avoid race conditions or other concurrency-related problems, it is sometimes necessary to isolate the effects of a group of actions from the effects of actions outside the group. This may be indicated by setting the mustIsolate attribute to true on a structured activity node. If a structured activity node is "isolated," then any object used by an action within the node cannot be accessed by any action outside the node until the structured activity node as a whole completes. Any concurrent actions that would result in accessing such objects are required to have their execution deferred until the completion of the node.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

A sequence node is a structured activity node that executes its actions in order.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

A start classifier behavior action is an action that starts the classifier behavior of the input.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

InvocationAction is an abstract class for the various actions that invoke behavior. In addition to targeting an object, invocation actions can also invoke behavioral features on ports from where the invocation requests are routed onwards on links deriving from attached connectors. Invocation actions may also be sent to a target via a given port, either on the sending object or on another object.

CallAction is an abstract class for actions that invoke behavior and receive return values.

StartObjectBehaviorAction is an action that starts the execution either of a directly instantiated behavior or of the classifier behavior of an object. Argument values may be supplied for the input parameters of the behavior. If the behavior is invoked synchronously, then output values may be obtained for output

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

A structured activity node is an executable activity node that may have an expansion into subordinate nodes as an activity group. The subordinate nodes must belong to only one structured activity node, although they may be nested. Because of the concurrent nature of the execution of actions within and across activities, it can be difficult to guarantee the consistent access and modification of object memory. In order to avoid race conditions or other concurrency-related problems, it is sometimes necessary to isolate the effects of a group of actions from the effects of actions outside the group. This may be indicated by setting the mustIsolate attribute to true on a structured activity node. If a structured activity node is "isolated," then any object used by an action within the node cannot be accessed by any action outside the node until the structured activity node as a whole completes. Any concurrent actions that would result in accessing such objects are required to have their execution deferred until the completion of the node.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

A test identity action is an action that tests if two values are identical objects.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

An unmarshall action is an action that breaks an object of a known type into outputs each of which is equal to a value from a structural feature of the object.

A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element.

An action is a named element that is the fundamental unit of executable functionality.

The execution of an action represents some transformation or processing in the modeled system, be it a computer system or otherwise.

An action represents a single step within an activity, that is, one that is not further decomposed within the activity.

An action has pre- and post-conditions.

A value specification action is an action that evaluates a value specification.