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SEMI E125-0305 © SEMI 2003, 2005 32 10.8.4 Transition — This class represents a transition between any two states contained within the same StateMachi ne, including substates. Each transition references one “source”, or …

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10.8.2.4 StateMachine Association Definition Table
Table 52 StateMachine Association Definition
Association Role Name Definition Comments
top The top-level state for this state model. One and only one element of type State.
transitions A list of zero or more transitions between the
states and substates that comprise this state
machine.
List of one or more elements of type Transition.
events The events that the equipment generates when a
transition between states occurs
List of zero or more elements of type Event.
10.8.3 State — This class represents a single state contained within a state machine. Each State can contain zero or
more substates, or zero or more StateMachines, but cannot contain both substates and StateMachines. A substate
represents a state-within-a-state. A StateMachine represents a state-machine-within-a-state. For example, if a given
state contained 2 concurrently executing state machines, each concurrent state machine would be represented as a
stateMachine within the containing state. Initial states shall have a name attribute equal to “Initial”, final states shall
have a name attribute equal to “Final”.
10.8.3.1 State Attribute Definition Table
Table 53 State Attribute Definition
Attribute Name Definition Required Form
name A human-readable name for this state. Y Text.
id A unique identifier for this state. Y Text, unique across all states in this
StateMachine.
description A description of the meaning or purpose of this state. Y Text.
10.8.3.2 SEMI Standard States
10.8.3.2.1 name — If the State represents a SEMI standard state, the value of this attribute shall be a URN of the
form: “urn:semi-org:state:<standard id>:<state machine>:<state path name>”.
10.8.3.2.1.1 <standard id> shall be a string formatted according to the SEMI standard form for representing a
specific version of a standard document (for example, “E87-1101”), no spaces, upper-case alphanumeric characters
and hyphens only.
10.8.3.2.1.2 <state machine> shall be the name of the state machine in which the transition is defined. This field
shall be equal to the state machine name as it appears in the standard, with each word in the name concatenated.
The state machine name shall use the camel case capitalization convention (that is, only the first letter of each word
in the state machine name is capitalized). For example, the state machine name for the SEMI E87 LOAD PORT
TRANSFER state machine would be “LoadPortTransfer”.
10.8.3.2.1.3 <state path name> shall be formed by concatenating the names of all states from the top level state in
the state machine to the state being described, including any substates in between. Each state name in the path shall
be separated by the ‘.’ character. State names shall have no spaces, use alphanumeric characters only, and use camel
case capitalization. For example, the E87 “SLOT MAP NOT READ” state of the Carrier state machine would have
a <state path name> equal to “Carrier.CarrierSlotMapStatus.SlotMapNotRead”.
10.8.3.3 State Association Definition Table
Table 54 State Association Definition
Association Role Name Definition Comments
substates A list of zero or more substates that comprise this
state.
List of zero or more elements of type State.
stateMachines A list of zero or more concurrently-executing
state models that comprise this state.
List of zero or more elements of type
StateMachine.
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10.8.4 Transition — This class represents a transition between any two states contained within the same
StateMachine, including substates. Each transition references one “source”, or “from” state, and one “target”, or
“to” state, representing the originating and ending states. There must be one Transition defined for all possible state
transitions in the StateMachine instance. History or conditional transitions are described by providing as many
transitions as there are possible conditional or history-based outcomes. True Harel history transitions can be
accommodated by mapping all such transitions to a single event. The ‘description’ attribute can be used to provide a
human-readable description of the condition under which the transition takes place.
10.8.4.1 Transition Attribute Definition Table
Table 55 Transition Attribute Definition
Attribute Name Definition Required Form
id A unique identifier for this transition. Y Text, unique across all transitions in
this StateMachine.
name A human-readable name for this transition. N Text.
description A description of the meaning or purpose of this
transition.
Y Text.
10.8.4.2 SEMI Standard Transitions
10.8.4.2.1 name — If the Transition represents a SEMI standard transition, the value of this attribute shall be a
URN of the form: “urn:semi-org:transition:<standard id>:<state machine>:<transition number>:<transition name>”.
10.8.4.2.1.1 <standard id> shall be a string formatted according to the SEMI standard form for representing a
specific version of a standard document (for example, “E87-1101”), no spaces, upper-case alphanumeric characters
and hyphens only.
10.8.4.2.1.2 <state machine> shall be the name of the state machine in which the transition is defined. This field
shall be equal to the state machine name as it appears in the standard, with each word in the name concatenated.
The state machine name shall use the camel case capitalization convention (that is, only the first letter of each word
in the state machine name is capitalized). For example, the state machine name for the SEMI E87 LOAD PORT
TRANSFER state machine would be “LoadPortTransfer”.
10.8.4.2.1.3 <transition number> shall be a string representation of the transition number as it appears in the state
machine definition.
10.8.4.2.1.4 <transition name> shall be formed by concatenating the names of the source and target states for the
<transition number>, separated by a hyphen. The state names shall have no spaces, use alphanumeric characters
only, and use camel case capitalization. If either of these states is an “initial” or “final” state, the words “Initial” or
“Final”, respectively, shall be used for the state name. For example, the event name for the E87 load port transfer
history transition from the initial state to “OUT OF SERVICE” would be “Initial-OutOfService”.
10.8.4.3 Transition Association Definition Table
Table 56 Transition Association Definition
Association Role Name Definition Comments
source The state of origin for this transition. References one and only one state within this
StateMachine.
target The transitioned-to state. References one and only one state within this
StateMachine.
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10.8.5 Event — This class defines an event that the equipment generates as a result of a transition between any two
states contained within the same StateMachine, including substates. Each Event can reference one or more
transitions. This is in support of systems or standards that use the same event id to communicate different
transitions. Such implementations typically make additional data available with the event occurrence for
distinguishing between the different transitions. Note that it is not possible for two different events to be defined for
the same transition.
10.8.6 State Machine Instances
10.8.6.1 State machines are intended to be defined once and re-used wherever there is an equipment component or
other entity that can generate the same set of events defined by that state machine. However, each entity that
supports a given state machine may report different data for those events. Figure 20 shows the classes that are used
to describe the Parameters available for reporting with the events from a given state machine supported by a given
entity.
Figure 20
Describing State Machine Instances
10.8.6.2 StateMachineInstance — This class is used to declare that an equipment node or other entity supports a
specific state machine described in the metadata. It provides a way to describe the data such entities provide with
the events from that state machine as well as the Parameters used to determine the current state of the entity that
supports the state machine. The class can be used to describe the events and data available from top-level state
machines as well as any nested state machines defined within the top level state machine.
10.8.6.3 StateMachineInstance Attribute Definition Table
Table 57 StateMachineInstance Attribute Definition
Attribute Name Definition Form
stateMachineId Identifies a top level or nested state machine. Text, equal to a valid ‘id’ attribute of
the StateMachine class.
eventId
nestedStateMachines
0..*
1
stateMachineId
StateMachineInstance
1
1
1
eventMaps
1..*
description
EventToParameterMap
0..*
0..*availableParameters
0..1
currentStateName
0..1 previousStateName
Parameter