Template: OASIS:PropertyValueNumeric

This section specifies the template PropertyValueNumeric.

The specification comprises a SysML Block that represents the template and an associated Parametric Diagram that defines the templates and PLCS PSMTemplate objects instantiated by the PropertyValueNumeric template.

The specification comprises the following sections:

NOTE    An explanation of a template and its specification is provided in the Template overview

The PropertyValueNumeric template describes how to represent a single numerical value with unit for a specified property. It provides a context for the value, and optionally includes the date/time when measured.

EXAMPLE    The number of hours taken to perform some action.

The SysML Block Definition diagram in Figure 1 shows how Properties are represented in the PLCS PSM.

NOTE    Figure 1 only shows minimal set of information needed to represent properties. More advanced representation of properties that enables representation of features such as tolerances is given in Figure Properties in the PLCS PSM.
Figure 1 -  Property model

The following templates are related to the PropertyValueNumeric template:

NOTE    The PropertyValueNumeric 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 PSMTemplate 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.

The SysML Parametric diagrams for the template Block are shown in template parametric diagram section.

Figure 2 -  Template block definition diagram for PropertyValueNumeric

The following SysML Part, Reference, and Value properties are defined for this template:

References:
property [1] (Block: Ap239Ap233Psm:ProxyItemSelect)
The specification of the property that this is a value of.
The reference data used in Block: Ap239Ap233Psm:ProxyItemSelect is restricted as follows:
RDL constraint 1:
The reference data for:
ExternalOwlObject.individual
is restricted to individuals that are members of the following class:
unit [1] (Block: Ap239Ap233Psm:ProxyItemSelect)
The unit for the value. e.g. "Kilogramme"
The reference data used in Block: Ap239Ap233Psm:ProxyItemSelect is restricted as follows:
RDL constraint 1:
The reference data for:
ExternalOwlObject.individual
is restricted to individuals that are members of the following class:
context [0..1] (Block: Ap239Ap233Psm:NumericalContext)
The specification of the representation context, i.e. accuracy and unit information for a class of numerical values. This property is defaulted to a general context in which no information is specified for accuracy and units.
Parts:
classifier [0..*] (Template: OASIS:Classifier)
Classification of PropertyValue.
Values:
value [1] (Real)
The value of the property as a numeric representation e.g. 5.
dateMeasured [0..1] (Block: Ap239Ap233Psm:DateTimeString)
The optional date/time when the property value was measured.

The following constraint, normally a uniqueness constraint, is applicable when instantiating the DateTimeString:

rule.Ap239Ap233Psm.ExternalOwlClass.ur1
Constraint: XSDDATETIME
Specification: (OCL2.0)
self.matches('[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}Z')
significantDigits [0..1] (Integer)
An Optional number of significant digits that apply to the value.

The following output ports are defined for this template:

value (Block: Ap239Ap233Psm:PropertyValue)
Enables the Block: Ap239Ap233Psm:PropertyValue instantiated by this template to be referenced when the template is used.
The PropertyValue for use in relationships with other objects.

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 PSMTemplate objects that are required to represent the template PropertyValueNumeric.

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 a Parametric Diagram.

PLCS PSM objects are shaded khaki and Templates are shaded light green in a Parametric Diagram.

Figure 3 -  Parametric diagram for PropertyValueNumeric

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:propertyValue [1] (Block: Ap239Ap233Psm:NumericalValue)
Private Reference Property:prop [1] (Block: Ap239Ap233Psm:ExternalPropertyDefinition)

The following constraint, normally a uniqueness constraint, is applicable when instantiating the ExternalPropertyDefinition:

rule.Ap239Ap233Psm.ExternalOwlClass.ur1
Constraint: UR1
Specification: (OCL2.0)
ExternalPropertyDefinition::allInstances()->isUnique(definition)
Private Reference Property:theUnit [1] (Block: Ap239Ap233Psm:ExternalUnit)

The following constraint, normally a uniqueness constraint, is applicable when instantiating the ExternalUnit:

rule.Ap239Ap233Psm.ExternalOwlClass.ur1
Constraint: UR1
Specification: (OCL2.0)
ExternalUnit::allInstances()->isUnique(definition)
Private Part Property:dateAssignment [0..1] (Block: Ap239Ap233Psm:DateTimeAssignment)
Private Reference Property:dateMeasuredObj [0..1] (Block: Ap239Ap233Psm:ExternalOwlClass)

The following constraint, normally a uniqueness constraint, is applicable when instantiating the ExternalOwlClass:

rule.Ap239Ap233Psm.ExternalOwlClass.ur1
Constraint: ur1
Specification: (OCL2.0)
ExternalOwlClass::allInstances()->isUnique(class)
Private Part Property:dateClassification [1] (Template: OASIS:Classifier)

Figure 3 shows the instances that have been instantiated in the template. These are used to set the default value of blocks.

Instance diagram
Figure 3 -  Model instance diagram for PropertyValueNumeric

The following instances have been created:

classDateMeasured instance of Block: Ap239Ap233Psm:ExternalOwlClass.

This is used in the definition of the template to ensure the date assignment is correctly classified.

There are no constraint blocks defined in this template.

The following section provides an example XML dataset that has been instantiated in accordance with this template.

Data set: Property

Property numeric_property.xml View download

This example shows the XML instantiated to represent a property, its value and unit.

The Property is Weight, its value 1.3 kilogrammes: