This section specifies the template Observation.
The specification comprises a SysML Block that represents the template and an
associated Parametric Diagram that defines the templates and
PLCS PSM objects
instantiated by the Observation template.
The specification comprises the following sections:
- Section Description provides a
description of the template;
- Section Template Block specifies the SysML
Block that represents the template;
- Section Template Properties specifies
the properties, i.e. the Part, Reference and Value properties of the
templates SysML Block;
- Section Template Output Ports
specifies the Output Ports of the templates SysML Block. These bind to the
templates and PLCS PSM objects
instantiated by the Observation template as
described in section Template
Parametric Diagram;
- Section Template Constraints specifies
the constraints on PLCS PSM objects instantiated by the
Observation template;
- Section Template Parametric
Diagram specifies the templates and PLCS PSM objects instantiated by the
Observation template;
- Section Instantiated blocks specifies
the templates and PLCS PSM objects instantiated by the
Observation template and bound to private
parts of the template;
- Section Default instances species the
instances that have been instantiated in the template. These are used to set
the default value of blocks.
- Section Constraint blocks identifies the
constraint blocks that have been specified in this template;
- Section Example data
provides example XML data sets that have been instantiated in accordance
with this template.
NOTE
An explanation of a template and its specification is provided in
the
Template
overviewThis template describes how to represent an observation made on something such as
a product or an activity. A typical observation is the symptom of a fault
The SysML Block Definition diagram in Figure 1
shows how Observation is represented in the PLCS PSM.
Figure 1 - Observation model
No templates have been explicitly defined as being related to the Observation template.
NOTE
The Observation template may make reference
to other templates as part of the Parametric Diagram. These are not listed
here.
Figure 2 shows the SysML Block that represents the template. The Block is an abstraction
representing a pattern of templates and PLCS PSM objects.
The properties, i.e. the SysML Block Part, Reference and Value properties, of the
template's SysML Block are described in the Template
Properties section.
The output ports shown on the template's SysML Block are described in the template output ports section.
Figure 2 - Template block definition diagram for Observation
The following Part, Reference, and Value properties are defined for this template:
References:
observedDuring [0..1] (Block: Ap239Ap233Psm:
ActivityActual)
the ActivityActual that was being performed when the observation was made. The
value of this attribute need not be specified.
EXAMPLE 3
An unexpected problem may be found during a maintenance activity, in which case the
ActivityActual is the maintenance activity itself.
EXAMPLE 4
Aircraft health monitoring data is collected during a flight. The flight profile may
be recorded using the
ActivityActual.
NOTE 3
Some business rules may require that an observation is always made against an
ActivityActual, while others may not require that the activity be recorded.
inContext [0..*] (Block: Ap239Ap233Psm:
ObservedContextSelect)
the context in which the observation is made.
EXAMPLE
A problem is found during a maintenance operation. The set of contexts can include
the equipment being maintained, the end product the equipment is fitted to, the activity
being undertaken, the manual that describes the activity and the resources being used.
Parts:
classifications [0..*] (Template: OASIS:
Classifier)
The classifications of the Observation made.
The reference data used in Template: OASIS:
Classifier is restricted as follows:
RDL constraint 1:The reference data for:
OASIS:Classifier.class -> ExternalOwlClass.class
is restricted to classes that are subclasses of the following class:
ids [1..*] (Template: OASIS:
Identification)
The collection of identifiers of the observation.
The reference data used in Template: OASIS:
Identification is restricted as follows:
RDL constraint 1:The id must be classified as a Observation_identification_code or a
subclass thereof.
The reference data for:
OASIS:Identification.role -> ExternalOwlClass.class
is restricted to the following class or a subclass:
names [0..*] (Template: OASIS:
Name)
The collection of names of the observation.
Values:
The following output ports are defined for this template:
observation (Block: Ap239Ap233Psm:
Observation)
Enables the
Block: Ap239Ap233Psm:
Observation instantiated by this template to be referenced
when the template is used.
There are no constraints defined for this template.
This section describes the template's Parametric Diagram. The diagram details
the pattern of templates and PLCS PSM objects that are required to
represent the template Observation.
The public properties, i.e. those visible in the template's SysML block (See Figure 2) are shown on the left of a
Parametric Diagram.
NOTE
Restrictions on the reference data to be set on the public properties is
defined in the
Template Properties section.
The output ports are shown on the right of the Parametric Diagram.
PLCS PSM
objects are shaded khaki and template shaded light green in a Parametric Diagram.
Figure 3 - Parametric diagram for Observation
The following blocks are instantiated by this template and bound to private parts
of the
template as shown in the Parametric Diagram
section:
Private Part Property:
observation [1] (Block: Ap239Ap233Psm:
Observation)
Private Reference Property:
classDateOfObservation [0..1] (Block: Ap239Ap233Psm:
ExternalOwlClass)
The following constraint, normally a uniqueness constraint, is
applicable when instantiating the ExternalOwlClass:
rule.Ap239Ap233Psm.ExternalOwlClass.ur1
Constraint: ur1Specification: (OCL2.0)
ExternalOwlClass::allInstances()->isUnique(class)
Private Part Property:
dateClassifier [0..1] (Template: OASIS:
Classifier)
Private Part Property:
persOrgClassifier [0..*] (Template: OASIS:
Classifier)
Private Reference Property:
classObserver [0..1] (Block: Ap239Ap233Psm:
ExternalOwlClass)
The following constraint, normally a uniqueness constraint, is
applicable when instantiating the ExternalOwlClass:
rule.Ap239Ap233Psm.ExternalOwlClass.ur1
Constraint: ur1Specification: (OCL2.0)
ExternalOwlClass::allInstances()->isUnique(class)
Figure 3 shows the instances that have been instantiated in the template. These are
used to set the default value of blocks.
Figure 3 - Model instance diagram for Observation
The following instances have been created:
classObserver instance of Block: Ap239Ap233Psm:
ExternalOwlClass.
This is used within the template definition to classify the person organization assignment.
There are no constraint blocks defined in this template.
No example data sets have been provided for this DEX.