IfcSIPrefix

Semantic definitions at the type

Type definition

NOTE Definition according to ISO/CD 10303-41:1992
An SI prefix is the name of a prefix that may be associated with an SI unit. The definitions of SI prefixes are specified in ISO 1000 (clause 3).

NOTE The prefix defines multiples and submultiples of the SI units.

NOTE Type adapted from si_prefix defined in ISO 10303-41.

HISTORY New entity in IFC1.5.1.

Enumeration definition

Constant	Description
EXA	10^18.
PETA	10^15.
TERA	10^12.
GIGA	10^9.
MEGA	10^6.
KILO	10^3.
HECTO	10^2.
DECA	10.
DECI	10^-1.
CENTI	10^-2.
MILLI	10^-6.
MICRO	10^-6.
NANO	10^-9.
PICO	10^-12.
FEMTO	10^-15.
ATTO	10^-18.

Formal representations

XML Specification

 <xs:simpleType name="IfcSIPrefix">

  <xs:restriction base="xs:string">

   <xs:enumeration value="exa"/>

   <xs:enumeration value="peta"/>

   <xs:enumeration value="tera"/>

   <xs:enumeration value="giga"/>

   <xs:enumeration value="mega"/>

   <xs:enumeration value="kilo"/>

   <xs:enumeration value="hecto"/>

   <xs:enumeration value="deca"/>

   <xs:enumeration value="deci"/>

   <xs:enumeration value="centi"/>

   <xs:enumeration value="milli"/>

   <xs:enumeration value="micro"/>

   <xs:enumeration value="nano"/>

   <xs:enumeration value="pico"/>

   <xs:enumeration value="femto"/>

   <xs:enumeration value="atto"/>

  </xs:restriction>

 </xs:simpleType>

EXPRESS Specification


TYPE IfcSIPrefix = ENUMERATION OF (

 EXA, 
 PETA, 
 TERA, 
 GIGA, 
 MEGA, 
 KILO, 
 HECTO, 
 DECA, 
 DECI, 
 CENTI, 
 MILLI, 
 MICRO, 
 NANO, 
 PICO, 
 FEMTO, 
 ATTO);
END_TYPE;


 EXPRESS-G diagram

	SIPrefix
	Préfixe d'unité internationale