Klassifikationssystem | |
Classification | |
Classification |
Item | SPF | XML | Change | Description | IFC2x3 to IFC4 |
---|---|---|---|---|
IfcClassification | ||||
Source | MODIFIED | Instantiation changed to OPTIONAL. | ||
Edition | MODIFIED | Instantiation changed to OPTIONAL. | ||
EditionDate | X | X | MODIFIED | Type changed from IfcCalendarDate to IfcDate. |
Description | ADDED | |||
Location | ADDED | |||
ReferenceTokens | ADDED |
An IfcClassification is used for the arrangement of objects into a class or category according to a common purpose or their possession of common characteristics. A classification in the sense of IfcClassification is taxonomy, or taxonomic scheme, arranged in a hierarchical structure. A category of objects relates to other categories in a generalization-specialization relationship. Therefore the classification items in an classification are organized in a tree structure.
The IfcClassification identifies the classification system or source to which a classification reference refers to. Each classification reference may reference an instance of IfcClassification. A classification system declared may be either formally published, or it may be a locally defined method of classifiying information.
NOTE Examples for such formally published classifications are Omniclass, Uniclass, Masterformat, or DIN277.
There are two methods to define and reference a classification system:
HISTORY New entity in IFC1.5
IFC 2x4 CHANGE Attribute Edition made optional. Attributes: Description, Location, and ReferenceTokens and inverse attribute HasReferences added.
# | Attribute | Type | Cardinality | Description | C |
---|---|---|---|---|---|
1 | Source | IfcLabel | [0:1] |
Source (or publisher) for this classification.
NOTE that the source of the classification means the person or organization that was the original author or the person or organization currently acting as the publisher. | X |
2 | Edition | IfcLabel | [0:1] |
The edition or version of the classification system from which the classification notation is derived.
NOTE the version labeling system is specific to the classification system. | X |
3 | EditionDate | IfcDate | [0:1] |
The date on which the edition of the classification used became valid.
NOTE The indication of edition may be sufficient to identify the classification source uniquely but the edition date is provided as an optional attribute to enable more precise identification where required. | X |
4 | Name | IfcLabel | [1:1] |
The name or label by which the classification used is normally known.
NOTE Examples of names include CI/SfB, Masterformat, BSAB, Uniclass, STABU, DIN276, DIN277 etc. | X |
5 | Description | IfcText | [0:1] | Additional description provided for the classification. | X |
6 | Location | IfcURIReference | [0:1] | Resource identifier or locator, provided as URI, URN or URL, of the classification. | X |
7 | ReferenceTokens | IfcIdentifier | L[1:?] |
The delimiter tokens that are used to mark the boundaries of individual facets (substrings) in a classification reference.
This typically applies then the IfcClassification is used in conjuction with IfcClassificationReference's. If only one ReferenceToken is provided, it applies to all boundaries of individual facets, if more than one ReferenceToken are provided, the first token applies to the first boundary, the second token to the second boundary, and the n NOTE Tokens are typically recommended within the classification itself and each token will have a particular role. EXAMPLE 1 To indicate that the facet delimiter used for DIN277-2 reference key "2.1" ("Office rooms") is ".", a single ReferenceToken ['.'] is provided. To indicate that the facet delimiter used for Omniclass Table 13 (space by function) reference key "13-15 11 34 11" ("Office") are "-" and " ", two ReferenceToken's ['-', ' '] are provided. EXAMPLE 2 The use of ReferenceTokens can also be extended to include masks. The use need to be agreed in view definitions or implementer agreements that stipulates a "mask syntax" that should be used. | X |
ClassificationForObjects | IfcRelAssociatesClassification @RelatingClassification | S[0:?] | The classification with which objects are associated. | X | |
HasReferences | IfcClassificationReference @ReferencedSource | S[0:?] | The classification references to which the classification applies. It can either be the final classification notation, or an intermediate classification item. | X |
# | Attribute | Type | Cardinality | Description | C |
---|---|---|---|---|---|
IfcExternalInformation | |||||
IfcClassification | |||||
1 | Source | IfcLabel | [0:1] |
Source (or publisher) for this classification.
NOTE that the source of the classification means the person or organization that was the original author or the person or organization currently acting as the publisher. | X |
2 | Edition | IfcLabel | [0:1] |
The edition or version of the classification system from which the classification notation is derived.
NOTE the version labeling system is specific to the classification system. | X |
3 | EditionDate | IfcDate | [0:1] |
The date on which the edition of the classification used became valid.
NOTE The indication of edition may be sufficient to identify the classification source uniquely but the edition date is provided as an optional attribute to enable more precise identification where required. | X |
4 | Name | IfcLabel | [1:1] |
The name or label by which the classification used is normally known.
NOTE Examples of names include CI/SfB, Masterformat, BSAB, Uniclass, STABU, DIN276, DIN277 etc. | X |
5 | Description | IfcText | [0:1] | Additional description provided for the classification. | X |
6 | Location | IfcURIReference | [0:1] | Resource identifier or locator, provided as URI, URN or URL, of the classification. | X |
7 | ReferenceTokens | IfcIdentifier | L[1:?] |
The delimiter tokens that are used to mark the boundaries of individual facets (substrings) in a classification reference.
This typically applies then the IfcClassification is used in conjuction with IfcClassificationReference's. If only one ReferenceToken is provided, it applies to all boundaries of individual facets, if more than one ReferenceToken are provided, the first token applies to the first boundary, the second token to the second boundary, and the n NOTE Tokens are typically recommended within the classification itself and each token will have a particular role. EXAMPLE 1 To indicate that the facet delimiter used for DIN277-2 reference key "2.1" ("Office rooms") is ".", a single ReferenceToken ['.'] is provided. To indicate that the facet delimiter used for Omniclass Table 13 (space by function) reference key "13-15 11 34 11" ("Office") are "-" and " ", two ReferenceToken's ['-', ' '] are provided. EXAMPLE 2 The use of ReferenceTokens can also be extended to include masks. The use need to be agreed in view definitions or implementer agreements that stipulates a "mask syntax" that should be used. | X |
ClassificationForObjects | IfcRelAssociatesClassification @RelatingClassification | S[0:?] | The classification with which objects are associated. | X | |
HasReferences | IfcClassificationReference @ReferencedSource | S[0:?] | The classification references to which the classification applies. It can either be the final classification notation, or an intermediate classification item. | X |
<xs:element name="IfcClassification" type="ifc:IfcClassification" substitutionGroup="ifc:IfcExternalInformation" nillable="true"/>
<xs:complexType name="IfcClassification">
<xs:complexContent>
<xs:extension base="ifc:IfcExternalInformation">
<xs:sequence>
<xs:element name="ReferenceTokens" nillable="true" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:element ref="ifc:IfcIdentifier-wrapper" maxOccurs="unbounded"/>
</xs:sequence>
<xs:attribute ref="ifc:itemType" fixed="ifc:IfcIdentifier-wrapper"/>
<xs:attribute ref="ifc:cType" fixed="list"/>
<xs:attribute ref="ifc:arraySize" use="optional"/>
</xs:complexType>
</xs:element>
<xs:element name="HasReferences" nillable="true" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:element ref="ifc:IfcClassificationReference" minOccurs="0" maxOccurs="unbounded"/>
</xs:sequence>
<xs:attribute ref="ifc:itemType" fixed="ifc:IfcClassificationReference"/>
<xs:attribute ref="ifc:cType" fixed="set"/>
<xs:attribute ref="ifc:arraySize" use="optional"/>
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name="Source" type="ifc:IfcLabel" use="optional"/>
<xs:attribute name="Edition" type="ifc:IfcLabel" use="optional"/>
<xs:attribute name="EditionDate" type="ifc:IfcDate" use="optional"/>
<xs:attribute name="Name" type="ifc:IfcLabel" use="optional"/>
<xs:attribute name="Description" type="ifc:IfcText" use="optional"/>
<xs:attribute name="Location" type="ifc:IfcURIReference" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
ENTITY IfcClassification
SUBTYPE OF (IfcExternalInformation);
Source : OPTIONAL IfcLabel;
Edition : OPTIONAL IfcLabel;
EditionDate : OPTIONAL IfcDate;
Name : IfcLabel;
Description : OPTIONAL IfcText;
Location : OPTIONAL IfcURIReference;
ReferenceTokens : OPTIONAL LIST [1:?] OF IfcIdentifier;
INVERSE
ClassificationForObjects : SET OF IfcRelAssociatesClassification FOR RelatingClassification;
HasReferences : SET OF IfcClassificationReference FOR ReferencedSource;
END_ENTITY;