IfcSIPrefix

Semantic definitions at the type

Type definition

Definition from 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 Corresponding STEP name: SI_prefix, please refer to ISO/IS 10303-41:1994 for the final definition of the formal standard.

ENUMERATION

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^-3.
MICRO 10^-6.
NANO 10^-9.
PICO 10^-12.
FEMTO 10^-15.
ATTO 10^-18.

HISTORY New entity in IFC Release 1.5.1.

Enumeration definition

Constant	Description
EXA
PETA
TERA
GIGA
MEGA
KILO
HECTO
DECA
DECI
CENTI
MILLI
MICRO
NANO
PICO
FEMTO
ATTO

Formal representations

XSD 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