IfcSIPrefix

Natural language names
SIPrefix
Préfixe d'unité internationale
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
ConstantDescription
EXA10^18.
PETA10^15.
TERA10^12.
GIGA10^9.
MEGA10^6.
KILO10^3.
HECTO10^2.
DECA
DECI10^-1.
CENTI10^-2.
MILLI10^-6.
MICRO10^-6.
NANO10^-9.
PICO10^-12.
FEMTO10^-15.
ATTO10^-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;

Link to EXPRESS-G diagram EXPRESS-G diagram

References  References: IfcSIUnit

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