EXPRESS Definition
EXPRESS-G Diagram
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EXPRESS Definition |
EXPRESS-G Diagram |
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
M IfcMeasureValue U IfcUnit
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
C IfcCurrencyEnum D IfcDerivedUnitEnum S IfcSiPrefix
IfcSiUnitNameU IfcUnitEnum
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
C IfcContextDependentUnit
IfcConversionBasedUnitD IfcDerivedUnit
IfcDerivedUnitElement
IfcDimensionalExponentsM IfcMeasureWithUnit N IfcNamedUnit S IfcSiUnit U IfcUnitAssignment
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
C IfcCorrectDimensions D IfcDeriveDimensionalExponents
IfcDimensionsForSiUnit
The IfcMeasureResource schema is adapted from the ISO 10303 part 41 Measure schema and specifies units and measures that may be assigned to quantities.
Additional measures have been added to this schema to meet particular domain requirements.
The fundamental unit type used in this schema is based on the SI system defined in ISO 1000. Units in measurement systems other than SI may be derived using this schema.
A number of units of measure are identified using their derived units which are specified in terms of fundamental units as follows:
- Joule [J] kg.deg K/sec [W/sec]
- Newton [N] kg.m/sec^2
- Pascal [Pa} kg/m.sec^2 [N/m^2]
- Watt [W] kg.deg K
Parts of this schema are © ISO.
EXPRESS Definition
An amount of substance measure is the value for the quantity of a substance when compared with the number of atoms in 0.012kilogram of carbon 12.
REAL
EXPRESS Definition
A measure of the velocity of a body measured in terms of angle subtended per unit time.
Usually measured in radians/s.
New Defined Type in IFC Release 2.0
REAL
EXPRESS Definition
An area measure is the value of the extent of a surface.
REAL
EXPRESS Definition
A defined data type of simple data type Boolean. . (Required since a select type, i.e. IfcMeasureValue, cannot include directly simple types in its select list).
BOOLEAN
EXPRESS Definition
A compound measure of plane angle in degrees minutes and seconds of arc.
IfcCompoundPlaneAngleMeasure is used where angles need to be described to an accuracy of less than one degree and expressed as parts of an arc. It may be used for angular measurement by surveyors or for other angular measurements where precision is required. It should not be used for angular measurements which may be expressed in decimal fractions of a degree; for which purpose the IfcPlaneAngleMeasure is provided.
LIST [3:3] OF INTEGER
WR1
{ 0 <= SELF[1] < 360 }
WR2
{ 0 <= SELF[2] < 60 }
WR3
{ 0 <= SELF[3] < 60 }
EXPRESS Definition
A context dependent measure is a general purpose real number measure type.
REAL
EXPRESS Definition
A count measure is the value of a count.
NUMBER
EXPRESS Definition
A descriptive measure is a human interpretable definition of a quantifiable value.
STRING
EXPRESS Definition
A measure of the viscous resistance of a medium.
Usually measured in Pascals second
New Defined Type in IFC Release 2.0
REAL
EXPRESS Definition
A standard unit of measure for electrical current, equal to one Coulomb per second.
REAL
EXPRESS Definition
A measure of electromotive force.
Usually measured in Volts.
New Defined Type in IFC Release 2.0
REAL
EXPRESS Definition
A measure of energy required or used.
Usually measured in Joules.
New Defined Type in IFC Release 2.0
REAL
EXPRESS Definition
A measure of the number of times that an item revolves, vibrates etc. in unit time.
Usually measured in revolutions/second or Herz.
New Defined Type in IFC Release 2.0
REAL
EXPRESS Definition
A measure of the density of heat flux within a body.
Usually measured in Watts/meters2.
New Defined Type in IFC Release 2.0
REAL
EXPRESS Definition
A defined type of simple data type Integer. (Required since a select type, i.e. IfcMeasureValue, cannot include directly simple types in its select list).
In principle, the domain of IfcInteger (being an Integer) is all integer numbers. Here the number of bits used for the IfcInteger representation is unconstrained, but in practise it’s implementation specific.
INTEGER
EXPRESS Definition
A measure of the integer number of units flowing per unit time.
This measure may be used for measuring integer units per second or per hour. For example, it may be used to measure the number of books per hour passing along a part of a mechanical book handling system, the number of people per hour travelling along a moving walkway or the number of vehicles per hour travelling along a section of road.
New Defined Type in IFC Release 2.0
INTEGER
EXPRESS Definition
A measure of the viscous resistance of a medium to a moving body.
Usually measured in square meters/second.
New Defined Type in IFC Release 2.0
REAL
EXPRESS Definition
A length measure is the value of a distance.
REAL
EXPRESS Definition
A measure of the velocity of a body measured in terms of distance moved per unit time.
Usually measured in meters/second
New Defined Type in IFC Release 2.0
REAL
EXPRESS Definition
A luminous intensity measure is the value for the brightness of a body.
REAL
EXPRESS Definition
A measure of the density of a medium.
Usually measured in kilograms/cubic meters.
New Defined Type in IFC Release 2.0
REAL
EXPRESS Definition
A measure of the mass of a medium flowing per unit time.
Usually measured in kilograms/second
New Defined Type in IFC Release 2.0
REAL
EXPRESS Definition
A mass measure is the value of the amount of matter that a body contains.
REAL
EXPRESS Definition
A monetary measure is the value of an amount of money without regard to its currency.
New Defined Type in IFC Release 2.0
REAL
EXPRESS Definition
A numeric measure is the numeric value of a physical quantity.
NUMBER
EXPRESS Definition
A parameter value is the value which specifies the amount of a parameter in some parameter space.
REAL
EXPRESS Definition
A plane angle measure is the value of an angle in a plane.
IfcPlaneAngleMeasure is used where angles need to be described to an accuracy of less than one degree and expressed as decimal parts of an angle. It is widely used for angular measurement except for situations where accuracy needs to be defined using arc measurement; for which purpose the IfcCompoundPlaneAngleMeasure is provided.
REAL
EXPRESS Definition
A positive length measure is a length measure that is greater than zero.
IfcLengthMeasure
WR1
SELF > 0
EXPRESS Definition
A positive plane angle measure is a plane angle measure that is greater than zero.
IfcPlaneAngleMeasure
WR1
SELF > 0
EXPRESS Definition
A positive ratio measure is a ratio measure that is greater than zero.
IfcRatioMeasure
WR1
SELF > 0
EXPRESS Definition
A measure of power required or used.
Usually measured in Watts.
New Defined Type in IFC Release 2.0
REAL
EXPRESS Definition
A measure of the quantity of a medium acting on a unit area.
Usually measured in Pascals.
New Defined Type in IFC Release 2.0
REAL
EXPRESS Definition
A ratio measure is the value of the relation between two physical quantities that are of the same kind.
REAL
EXPRESS Definition
A defined type of simple data type Real (required since a select type, i.e. IfcMeasureValue, cannot include directly simple types in its select list).
In principle, the domain of IfcReal (being a Real) is all rational, irrational and scientific real numbers. Here the precision is unconstrained, but in practise it’s implementation specific.
REAL
EXPRESS Definition
A solid angle measure is the value of an angle in a solid.
REAL
EXPRESS Definition
A defined type of simple data type String. (Required since a select type, i.e. IfcMeasureValue, cannot include directly simple types in its select list).
STRING
EXPRESS Definition
The measure of the ability of a surface to smooth out temperature variations.
Usually measured in Watt / square meters degrees Kelvin.
New Defined Type in IFC Release 2.0
REAL
EXPRESS Definition
A measure of the resistance offered by a body to the flow of energy.
Usually measured in square meters degrees Kelvin / Watt.
New Defined Type in IFC Release 2.0
REAL
EXPRESS Definition
A measure of the rate at which energy is transmitted through a body.
Usually measured in Watts/ square meters degrees Kelvin.
New Defined Type in IFC Release 2.0
REAL
EXPRESS Definition
A thermodynamic temperature measure is the value for the degree of heat of a body.
REAL
EXPRESS Definition
A time measure is the value of the duration of periods.
REAL
EXPRESS Definition
An indication of date and time by measuring the number of seconds which have elapsed since the beginning of the year 1970.
INTEGER
EXPRESS Definition
A volume measure is the value of the solid content of a body.
REAL
EXPRESS Definition
A measure of the volume of a medium flowing per unit time.
Usually measured in cubic meters/second.
New Defined Type in IFC Release 2.0
REAL
EXPRESS Definition
A measure value is a value as defined in ISO 31-0 (clause 2).
IfcMeasureValue is a select data type which includes in its select list all various type of defined data type measures.
This Select Type has changed after IFC Release 1.5.1, please see the Migration Guide for details
EXPRESS Definition
A unit is a physical quantity, with a value of one, which is used as a standard in terms of which other quantities are expressed.
EXPRESS Definition
An enumeration type of currencies of various countries.
AED
United Arab Emirates
AES
Argentina
ATS
Austria
AUD
Australia
BBD
Barbados
BEG
Belgium
BGL
Bulgaria
BHD
Bahrain
BMD
Bermuda
BND
Brunei
BRL
Brazil
BSD
Bahamas
BWP
Botswana
BZD
Belize
CAD
Canada
CBD
Carribean
CHF
Switzerland
CLP
Chile
CNY
China
CYS
Cyprus
CZK
Czech Republic
DDP
Dominican Republic
DEM
Germany
DKK
Denmark
EGL
Egypt
EST
Spain
EUR
A currency adopted by a number of countries within the European Union from January 1st 1999. The zone in which the currency operates is termed 'Euroland' in financial transactions
FAK
Faroe Islands
FIM
Finland
FJD
Fiji
FKP
Falkland Islands
FRF
France
GBP
United Kingdom
GIP
Gibraltar
GMD
Gambia
GRX
Greece
HKD
Hong Kong
HUF
Hungary
ICK
Iceland
IDR
Indonesia
ILS
Israel
INR
India
IRP
Ireland
ITL
Italy
JMD
Jamaica
JOD
Jordan
JPY
Japan
KES
Kenya
KRW
Republic of Korea
KWD
Kuwait
KYD
Cayman Islands
LKR
Sri Lanka
LUF
Luxembourg
MTL
Malta
MUR
Mauritius
MXN
Mexico
MYR
Malaysia
NLG
Netherlands
NZD
New Zealand
OMR
Oman
PGK
Papua New Guinea
PHP
Philipines
PKR
Pakistan
PLN
Poland
PTN
Portugal
QAR
Qatar
RUR
Russia
SAR
Saudi Arabia
SCR
Seychelles
SEK
Sweden
SGD
Singapore
SKP
St.Helena
THB
Thailand
TRL
Turkey
TTD
Trinidad and Tobago
TWD
Taiwan
USD
United States of America
VEB
Venezuela
VND
Viet-Nam
XEU
Europe (States of the European Union)
ZAR
South Africa
ZWD
Zimbabwe
EXPRESS Definition
An enumeration type for allowed types of derived units.
AngularVelocityUnit
DynamicViscosityUnit
ElectricVoltageUnit
EnergyUnit
HeatfluxDensityUnit
IntegerCountRateUnit
KinematicViscosityUnit
LinearVelocityUnit
MassDensityUnit
MassFlowrateUnit
PowerUnit
PressureUnit
RotationalFrequencyUnit
ThermalAdmittanceUnit
ThermalResistanceUnit
ThermalTransmittanceUnit
VolumetricFlowrateUnit
UserDefined
NotDefined
EXPRESS Definition
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).
EXA
PETA
TERA
GIGA
MEGA
KILO
HECTO
DECA
DECI
CENTI
MILLI
MICRO
NANO
PICO
FEMTO
ATTO
EXPRESS Definition
An SI unit name is the name of an SI unit. The definitions of the names of SI units are specified in ISO 1000 (clause 2).
METRE
SQUARE_METRE
CUBIC_METRE
GRAM
SECOND
AMPERE
KELVIN
MOLE
CANDELA
RADIAN
STERADIAN
HERTZ
NEWTON
PASCAL
JOULE
WATT
COULOMB
VOLT
FARAD
OHM
SIEMENS
WEBER
TESLA
HENRY
DEGREE_CELSIUS
LUMEN
LUX
BECQUEREL
GRAY
SIEVERT
EXPRESS Definition
An enumeration type for allowed unit types of IfcNamedUnit.
LengthUnit
MassUnit
TimeUnit
DurationUnit
ElectricCurrentUnit
ThermodynamicTemperatureUnit
AmountOfSubstanceUnit
LuminousIntensityUnit
PlaneAngleUnit
SolidAngleUnit
AreaUnit
VolumeUnit
RatioUnit
Unspecified
 Fully Attributed View |
EXPRESS Definition |
An context dependent unit is a unit which is not related to the SI system.
The number of parts in an assembly is a physical quantity measured in units that may be called "parts" but which cannot be related to an SI unit.
IfcNamedUnit
IfcContextDependentUnit
Attribute type (OPT, DER, INV)
Redefinition (SELF)
Attribute / Relation
Data or Rel. type
Definition
Name
STRING
The word, or group of words, by which the context dependent unit is referred to.
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Fully Attributed View |
EXPRESS Definition |
A conversion based unit is a unit that is defined based on a measure with unit.
An inch is a converted unit. It is from the Imperial system, its name is "inch" and it can be related to the si unit, millimetre, through a measure with unit whose value is 25.4 millimetre. A foot is also a converted unit. It is from the Imperial system, its name is "foot" and it can be related to an si unit, millimetre, either directly or through the unit called "inch".
IfcNamedUnit
Attribute type (OPT, DER, INV)
Redefinition (SELF)
Attribute / Relation
Data or Rel. type
Definition
Name
STRING
The word, or group of words, by which the conversion based unit is referred to.
ConversionFactor
The physical quantity from which the converted unit is derived.
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EXPRESS Definition |
A derived unit is an expression of units.
Newton per square millimetre is a derived unit.
This Class has changed after IFC Release 1.5.1, please see the Migration Guide for details
This Class does not have any Superclasses or Subclasses
Attribute type (OPT, DER, INV)
Redefinition (SELF)
Attribute / Relation
Data or Rel. type
Definition
Elements
SET [1:?] OF IfcDerivedUnitElement
The group of units and their exponents that define the derived unit.
UnitType
Name of the derived unit – selected from a predefined enumeration for use in IFC models.
DER
Dimensions
Dimensional exponents are derived using the function IfcDerivedDimensionalExponents using (SELF) as the input value.
WR1
There shall be either more than one member in the elements set or the value of the exponent of the single element of the elements set shall not be equal to one.
(SIZEOF (Elements) > 1) OR ((SIZEOF (Elements) = 1) AND (Elements[1].Exponent <> 1 ))
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EXPRESS Definition |
A derived unit element is one of the unit quantities which makes up a derived unit.
EXAMPLE: Newtons per square millimetre is a derived unit. It has two elements, Newton whose exponent has a value of 1 and millimetre whose exponent is -2.
This Class does not have any Superclasses or Subclasses
Attribute type (OPT, DER, INV)
Redefinition (SELF)
Attribute / Relation
Data or Rel. type
Definition
Unit
The fixed quantity which is used as the mathematical factor.
Exponent
INTEGER
The power that is applied to the unit attribute.
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EXPRESS Definition |
The dimensionality of any quantity can be expressed as a product of powers of the dimensions of base quantities. The dimensional exponents entity defines the powers of the dimensions of the base quantities. All the physical quantities are founded on seven base quantities (ISO 31 (clause 2)).
Length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity are the seven base quantities.
EXAMPLE: A length of 2 millimetres has a length exponent of 1. The remaining exponents are equal to 0.
EXAMPLE: A velocity of 2 millimetres per second has a length exponent of 1 and a time exponent of -1. The remaining exponents are equal to 0.
This Class does not have any Superclasses or Subclasses
Attribute type (OPT, DER, INV)
Redefinition (SELF)
Attribute / Relation
Data or Rel. type
Definition
LengthExponent
INTEGER
The power of the length base quantity.
MassExponent
INTEGER
The power of the mass base quantity.
TimeExponent
INTEGER
The power of the time base quantity.
ElectricCurrentExponent
INTEGER
The power of the electric current base quantity.
ThermodynamicTemperatureExponent
INTEGER
The power of the thermodynamic temperature base quantity.
AmountOfSubstanceExponent
INTEGER
The power of the amount of substance base quantity.
LuminousIntensityExponent
INTEGER
The power of the luminous intensity base quantity.
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EXPRESS Definition |
A measure with unit is the specification of a physical quantity as defined in ISO 31 (clause 2).
This Class does not have any Superclasses or Subclasses
Attribute type (OPT, DER, INV)
Redefinition (SELF)
Attribute / Relation
Data or Rel. type
Definition
ValueComponent
the value of the physical quantity when expressed in the specified units.
UnitComponent
the unit in which the physical quantity is expressed.
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EXPRESS Definition |
A named unit is a unit quantity associated with the word, or group of words, by which the unit is identified.
This Class has changed after IFC Release 1.5.1, please see the Migration Guide for details
IfcNamedUnit
IfcConversionBasedUnit
IfcSiUnit
Attribute type (OPT, DER, INV)
Redefinition (SELF)
Attribute / Relation
Data or Rel. type
Definition
Dimensions
The exponents of the base properties by which the named unit is defined.
UnitType
Type of unit used.
WR1
Correct dimensions are established through the function IfcCorrectDimensions. IfcCorrectDimensions (SELF.UnitType, Self.Dimensions)
IfcCorrectDimensions (SELF.UnitType, SELF.Dimensions)
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Fully Attributed View |
EXPRESS Definition |
An SI unit is the fixed quantity used as a standard in terms of which items are measured as defined by ISO 1000 (clause 2).
IfcNamedUnit
Attribute type (OPT, DER, INV)
Redefinition (SELF)
Attribute / Relation
Data or Rel. type
Definition
OPT
Prefix
The SI Prefix
Name
The word, or group of words, by which the SI unit is referred to.
DER
Dimensions
SELF
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EXPRESS Definition |
A set of units which may be assigned.
NOTE: A project has a unit assignment which establishes the set of units which will be used. Other objects may have local unit assignments if there is a requirement for them to make use of units which do not fall within the project unit assignment.
This Class does not have any Superclasses or Subclasses
Attribute type (OPT, DER, INV)
Redefinition (SELF)
Attribute / Relation
Data or Rel. type
Definition
Units
SET [1:?] OF IfcUnit
Units to be included within a unit assignment.
EXPRESS Definition
The correct dimensions function returns the dimensional exponents of the given unit type.
Argument definitions:
X: (input) the name of the unit type for which the dimensional exponents are tested.
EXPRESS Definition
This function determines the dimensional exponents of a unit. For named units the dimensions attribute is returned and for derived units the dimensional exponents are calculated from its elements.
Argument definitions:
X: (input) the unit that the dimensional exponents are being derived from.
EXPRESS Definition
The dimensions for SI unit function returns the dimensional exponents of the given SI - unit.
Argument definitions:
N : (input) the name of the unit for which the dimensional exponents will be returned.
