IfcSimplePropertyTemplate

BACnet MVD

#### IfcSimplePropertyTemplate

Natural language names

| Einfaches Merkmal - Vorlage
| Simple Property Template
| Modèle de propriété simple

Change log

Item | SPF | XML | Change | Description
--- | --- | --- | --- | ---
IFC2x3 to IFC4
IfcSimplePropertyTemplate |  |  | ADDED |

##### Semantic definitions at the entity

Entity definition

The IfcSimplePropertyTemplate defines the template for all dynamically extensible properties, either the subtypes of IfcSimpleProperty, or the subtypes of IfcPhysicalSimpleQuantity. The individual property templates are interpreted according to their Name attribute and may have a predefined template type, property units, and property measure types. The correct interpretation of the attributes:

- PrimaryUnit
- SecondaryUnit
- PrimaryMeasureType
- SecondaryMeasureType

is determined by the TemplateType. The attributes Enumerators and Expression only apply to instances of IfcSimplePropertyTemplate having a particular TemplateType. The TemplateType also controls, which subtype of either IfcSimpleProperty or IfcPhysicalSimpleQuantity shall be used for property occurrences corresponding to this template.

The IfcSimplePropertyTemplate is part of the set of templates included in the IfcPropertySetTemplate. The template can be accessed throught the inverse attribute PartOfPsetTemplate The IfcPropertySetTemplate may define one or several instances of IfcPropertySet (or IfcElementQuantity). The definition assignment is established by the objectified relationship IfcRelDefinesByTemplate as shown in Figure 156. There is no direct link between an IfcSimplePropertyTemplate and a subtype of either IfcSimpleProperty or IfcPhysicalSimpleQuantity. The definition relationship between the template and the individual properties (or quantities) is established by the Name attributes.

> NOTE Constraints at IfcPropertySetTemplate and IfcPropertySet (and IfcElementQuantity) guarantee that the Name attributes of included property templates and individual properties are unique.

Figure 156 — Property template relationships

> HISTORY New entity in IFC4.

Attribute definitions

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---

5

TemplateType

IfcSimplePropertyTemplateTypeEnum

?

Property type defining whether the property template defines a property with a single value, a bounded value, a list value, a table value, an enumerated value, or a reference value. Or the quantity type defining whether the template defines a quantity with a length, area, volume, weight or time value.

> NOTE the value of this property determines the correct use of the PrimaryUnit, SecondaryUnit, PrimaryDataType, SecondaryDataType, and Expression attributes.

X

X

6

PrimaryMeasureType

IfcLabel

?

Primary measure type assigned to the definition of the property. It should be provided, if the PropertyType is set to:

- P_SINGLEVALUE: determining the measure type of IfcPropertySingleValue.NominalValue
- P_ENUMERATEDVALUE: determining the measure type of IfcPropertyEnumeratedValue.EnumerationValues
- P_BOUNDEDVALUE: determining the measure type of IfcPropertyBoundedValue.LowerBoundValue
- P_LISTVALUE: determining the measure type of IfcPropertyListValue.ListValues
- P_TABLEVALUE: determining the measure type of IfcPropertyTableValue.DefiningValues
- P_REFERENCEVALUE: determining the measure type of IfcPropertyTableValue.PropertyReference

> NOTE The value range of the measure type is within the select type IfcValue for all PropertyType's with the exeption of P_REFERENCEVALUE. Here it is within the select type IfcObjectReferenceSelect.

X

X

7

SecondaryMeasureType

IfcLabel

?

Secondary measure type assigned to the definition of the property. It should be provided, if the PropertyType is set to:

- P_BOUNDEDVALUE: determining the measure type of IfcPropertyBoundedValue.UpperBoundValue
- P_TABLEVALUE: determining the measure type of IfcPropertyTableValue.DefinedValues

The value range of the measure type is within the select type IfcValue for all PropertyType's with the exeption of P_ENUMERATEDVALUE. Here it is the comma delimited list of enumerators.

> NOTE The measure type of IfcPropertyEnumeration.EnumerationValues is provided as PrimaryDataType.

X

X

8

Enumerators

IfcPropertyEnumeration

?

Name of the property enumeration, and list of all valid enumerators being selectable values, assigned to the definition of the property. This attribute shall only be provided, if the PropertyType is set to:

- P_ENUMERATEDVALUE

X

X

9

PrimaryUnit

IfcUnit

?

Primary unit assigned to the definition of the property. It should be provided, if the PropertyType is set to:

- P_SINGLEVALUE: determining the IfcPropertySingleValue.Unit
- P_ENUMERATEDVALUE: determining the IfcPropertyEnumeration.Unit
- P_BOUNDEDVALUE: determining the IfcPropertyBoundedValue.Unit
- P_LISTVALUE: determining the IfcPropertyListValue.Unit
- P_TABLEVALUE: determining the IfcPropertyTableValue.DefiningUnit

X

X

10

SecondaryUnit

IfcUnit

?

Secondary unit assigned to the definition of the property. It should be provided, if the PropertyType is set to:

- P_TABLEVALUE: determining the IfcPropertyTableValue.DefinedUnit

X

X

11

Expression

IfcLabel

?

The expression used to store additional information for the property template depending on the PropertyType. It should the following definitions, if the PropertyType is set to:

- P_TABLEVALUE: the expression that could be evaluated to define the correlation between the defining values and the defined values.
- Q_LENGTH, Q_AREA, Q_VOLUME, Q_COUNT, Q_WEIGTH, Q_TIME: the formula to be used to calculate the quantity

> NOTE No value shall be asserted if the PropertyType is not listed above.

X

X

12

AccessState

IfcStateEnum

?

Information about the access state of the property. It determines whether a property be viewed and/or modified by any receiving application without specific knowledge of it.
Attribute use definition for IfcStateEnum

- READWRITE: Properties of this template are readable and writable. They may be viewed and modified by users of any application. These are typical informational properties set by a user.
- READONLY: Properties of this template are read-only. They may be viewed but not modified by users of any application. (Applications may generate such values). These are typical automatically generated properties that should be displayed only, but not written back.
- LOCKED: Properties of this template are locked. They may only be accessed by the owning application (the publisher of the property set template). These are typically application depended, internal properties that should not be published.
- READWRITELOCKED: Properties of this template are locked, readable, and writable. They may only be accessed by the owning application.
- READONLYLOCKED: Properties of this template are locked and read-only. They may only be accessed by the owning application.

X

X

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | B
--- | --- | --- | --- | --- | ---
IfcRoot
1 | GlobalId | IfcGloballyUniqueId |  | Assignment of a globally unique identifier within the entire software world. | X | X

2

OwnerHistory

IfcOwnerHistory

?

Assignment of the information about the current ownership of that object, including owning actor, application, local identification and information captured about the recent changes of the object,

> NOTE only the last modification in stored - either as addition, deletion or modification.

> IFC4 CHANGE The attribute has been changed to be OPTIONAL.

X

X

3 | Name | IfcLabel | ? | Optional name for use by the participating software systems or users. For some subtypes of IfcRoot the insertion of the Name attribute may be required. This would be enforced by a where rule. | X | X
4 | Description | IfcText | ? | Optional description, provided for exchanging informative comments. |  | X
IfcPropertyDefinition
| HasContext | IfcRelDeclares @RelatedDefinitions | S[0:1] |  |  | X
| HasAssociations | IfcRelAssociates @RelatedObjects | S[0:?] | Reference to the relationship IfcRelAssociates and thus to those externally defined concepts, like classifications, documents, or library information, which are associated to the property definition. |  | X
IfcPropertyTemplateDefinition
IfcPropertyTemplate
| PartOfComplexTemplate | IfcComplexPropertyTemplate @HasPropertyTemplates | S[0:?] | Reference to a complex property templates. It should only be provided, if the PropertyType of the referenced complex property template is set to COMPLEX. |  | X
| PartOfPsetTemplate | IfcPropertySetTemplate @HasPropertyTemplates | S[0:?] | Reference to the IfcPropertySetTemplate that defines the scope for the IfcPropertyTemplate. A single IfcPropertyTemplate can be defined within the scope of zero, one or many IfcPropertySetTemplate'. |  | X
IfcSimplePropertyTemplate

5

TemplateType

IfcSimplePropertyTemplateTypeEnum

?

Property type defining whether the property template defines a property with a single value, a bounded value, a list value, a table value, an enumerated value, or a reference value. Or the quantity type defining whether the template defines a quantity with a length, area, volume, weight or time value.

> NOTE the value of this property determines the correct use of the PrimaryUnit, SecondaryUnit, PrimaryDataType, SecondaryDataType, and Expression attributes.

X

X

6

PrimaryMeasureType

IfcLabel

?

Primary measure type assigned to the definition of the property. It should be provided, if the PropertyType is set to:

- P_SINGLEVALUE: determining the measure type of IfcPropertySingleValue.NominalValue
- P_ENUMERATEDVALUE: determining the measure type of IfcPropertyEnumeratedValue.EnumerationValues
- P_BOUNDEDVALUE: determining the measure type of IfcPropertyBoundedValue.LowerBoundValue
- P_LISTVALUE: determining the measure type of IfcPropertyListValue.ListValues
- P_TABLEVALUE: determining the measure type of IfcPropertyTableValue.DefiningValues
- P_REFERENCEVALUE: determining the measure type of IfcPropertyTableValue.PropertyReference

> NOTE The value range of the measure type is within the select type IfcValue for all PropertyType's with the exeption of P_REFERENCEVALUE. Here it is within the select type IfcObjectReferenceSelect.

X

X

7

SecondaryMeasureType

IfcLabel

?

Secondary measure type assigned to the definition of the property. It should be provided, if the PropertyType is set to:

- P_BOUNDEDVALUE: determining the measure type of IfcPropertyBoundedValue.UpperBoundValue
- P_TABLEVALUE: determining the measure type of IfcPropertyTableValue.DefinedValues

The value range of the measure type is within the select type IfcValue for all PropertyType's with the exeption of P_ENUMERATEDVALUE. Here it is the comma delimited list of enumerators.

> NOTE The measure type of IfcPropertyEnumeration.EnumerationValues is provided as PrimaryDataType.

X

X

8

Enumerators

IfcPropertyEnumeration

?

Name of the property enumeration, and list of all valid enumerators being selectable values, assigned to the definition of the property. This attribute shall only be provided, if the PropertyType is set to:

- P_ENUMERATEDVALUE

X

X

9

PrimaryUnit

IfcUnit

?

Primary unit assigned to the definition of the property. It should be provided, if the PropertyType is set to:

- P_SINGLEVALUE: determining the IfcPropertySingleValue.Unit
- P_ENUMERATEDVALUE: determining the IfcPropertyEnumeration.Unit
- P_BOUNDEDVALUE: determining the IfcPropertyBoundedValue.Unit
- P_LISTVALUE: determining the IfcPropertyListValue.Unit
- P_TABLEVALUE: determining the IfcPropertyTableValue.DefiningUnit

X

X

10

SecondaryUnit

IfcUnit

?

Secondary unit assigned to the definition of the property. It should be provided, if the PropertyType is set to:

- P_TABLEVALUE: determining the IfcPropertyTableValue.DefinedUnit

X

X

11

Expression

IfcLabel

?

The expression used to store additional information for the property template depending on the PropertyType. It should the following definitions, if the PropertyType is set to:

- P_TABLEVALUE: the expression that could be evaluated to define the correlation between the defining values and the defined values.
- Q_LENGTH, Q_AREA, Q_VOLUME, Q_COUNT, Q_WEIGTH, Q_TIME: the formula to be used to calculate the quantity

> NOTE No value shall be asserted if the PropertyType is not listed above.

X

X

12

AccessState

IfcStateEnum

?

Information about the access state of the property. It determines whether a property be viewed and/or modified by any receiving application without specific knowledge of it.
Attribute use definition for IfcStateEnum

- READWRITE: Properties of this template are readable and writable. They may be viewed and modified by users of any application. These are typical informational properties set by a user.
- READONLY: Properties of this template are read-only. They may be viewed but not modified by users of any application. (Applications may generate such values). These are typical automatically generated properties that should be displayed only, but not written back.
- LOCKED: Properties of this template are locked. They may only be accessed by the owning application (the publisher of the property set template). These are typically application depended, internal properties that should not be published.
- READWRITELOCKED: Properties of this template are locked, readable, and writable. They may only be accessed by the owning application.
- READONLYLOCKED: Properties of this template are locked and read-only. They may only be accessed by the owning application.

X

X

##### Definitions applying to Design Transfer View

Concept inheritance

# | Concept | Template | Model View
--- | --- | --- | ---
IfcRoot
| Revision Control | Revision Control | Design Transfer View

##### Definitions applying to BACnet View

Concept inheritance

# | Concept | Template | Model View
--- | --- | --- | ---
IfcRoot
| Revision Control | Revision Control | Design Transfer View

##### Formal representations

XML Specification
`<xs:element name="IfcSimplePropertyTemplate" type="ifc:IfcSimplePropertyTemplate" substitutionGroup="ifc:IfcPropertyTemplate" nillable="true"/>
<xs:complexType name="IfcSimplePropertyTemplate">
<xs:complexContent>
<xs:extension base="ifc:IfcPropertyTemplate">
<xs:sequence>
<xs:element name="Enumerators" type="ifc:IfcPropertyEnumeration" nillable="true" minOccurs="0"/>
<xs:element name="PrimaryUnit" nillable="true" minOccurs="0">
<xs:complexType>
<xs:group ref="ifc:IfcUnit"/>
</xs:complexType>
</xs:element>
<xs:element name="SecondaryUnit" nillable="true" minOccurs="0">
<xs:complexType>
<xs:group ref="ifc:IfcUnit"/>
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name="TemplateType" type="ifc:IfcSimplePropertyTemplateTypeEnum" use="optional"/>
<xs:attribute name="PrimaryMeasureType" type="ifc:IfcLabel" use="optional"/>
<xs:attribute name="SecondaryMeasureType" type="ifc:IfcLabel" use="optional"/>
<xs:attribute name="Expression" type="ifc:IfcLabel" use="optional"/>
<xs:attribute name="AccessState" type="ifc:IfcStateEnum" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcSimplePropertyTemplate
SUBTYPE OF (IfcPropertyTemplate);
TemplateType : OPTIONAL IfcSimplePropertyTemplateTypeEnum;
PrimaryMeasureType : OPTIONAL IfcLabel;
SecondaryMeasureType : OPTIONAL IfcLabel;
Enumerators : OPTIONAL IfcPropertyEnumeration;
PrimaryUnit : OPTIONAL IfcUnit;
SecondaryUnit : OPTIONAL IfcUnit;
Expression : OPTIONAL IfcLabel;
AccessState : OPTIONAL IfcStateEnum;
END_ENTITY;

EXPRESS-G diagram

`

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