QuantityTakeoffsAspects Schema
Alias: qto
Version: 1.0.2
Table of contents
- Entity Classes
- Relationship Classes
- ElementOwnsDimensionsAspect
- ElementOwnsDoorAspect
- ElementOwnsEnergyPerformanceAspect
- ElementOwnsFoundationAspect
- ElementOwnsMaterialAspect
- ElementOwnsPerimeterAspect
- ElementOwnsPileAspect
- ElementOwnsPipeAspect
- ElementOwnsQuantityTakeOffAspect
- ElementOwnsSideAreasAspect
- ElementOwnsSlabAspect
- ElementOwnsSlopeAspect
- ElementOwnsStairsAspect
- ElementOwnsStructuralLinearMemberAspect
- ElementOwnsSurfaceAreaAspect
- ElementOwnsThicknessAspect
- ElementOwnsVolumeAspect
- ElementOwnsWallAspect
- ElementOwnsWindowAspect
- Enumerations
Entity Classes
DimensionsAspect (Dimensions Aspect) EntityClass 
An aspect that defines basic object measurements: height, length width.
Base Class: QuantityTakeoffsAspects:QuantityTakeoffAspect
Properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| Height | Object's height/depth in meters. | double | |
| Length | Object's length in meters. | double | |
| Width | Object's width/thickness in meters. | double |
Inherited properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| Element | The bis:Element that owns this bis:ElementUniqueAspect | navigation |
DoorAspect EntityClass Deprecated
An aspect that describes the door type.
Base Class: QuantityTakeoffsAspects:QuantityTakeoffAspect
Properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| Type | Type of a door. | DoorType |
Inherited properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| Element | The bis:Element that owns this bis:ElementUniqueAspect | navigation |
EnergyPerformanceAspect EntityClass
An aspect that defines the overall energy efficiency rating of a building.
Base Class: QuantityTakeoffsAspects:QuantityTakeoffAspect
Properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| Rating | Energy performance rating defined as a number from 0 to 100. | double |
Inherited properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| Element | The bis:Element that owns this bis:ElementUniqueAspect | navigation |
FoundationAspect EntityClass
An aspect that describes the type of structural foundation.
Base Class: QuantityTakeoffsAspects:QuantityTakeoffAspect
Properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| Type | Type of a structural foundation. | FoundationType |
Inherited properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| Element | The bis:Element that owns this bis:ElementUniqueAspect | navigation |
MaterialAspect EntityClass Deprecated
An aspect that defines the basic properties of a material.
Base Class: QuantityTakeoffsAspects:QuantityTakeoffAspect
Properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| Material | Material name. | string | |
| MaterialDensity | Material density described as kilogram per meter cubed. | double | |
| Weight | Material weight in kilograms. | double |
Inherited properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| Element | The bis:Element that owns this bis:ElementUniqueAspect | navigation |
PerimeterAspect (Perimeter Aspect) EntityClass
An aspect that defines the length of the outline of a shape - perimeter.
Base Class: QuantityTakeoffsAspects:QuantityTakeoffAspect
Properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| Perimeter | Perimeter of the shape in meters. | double |
Inherited properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| Element | The bis:Element that owns this bis:ElementUniqueAspect | navigation |
PileAspect EntityClass
An aspect that defines the depth of a vertical structural element of a deep foundation - pile.
Base Class: QuantityTakeoffsAspects:QuantityTakeoffAspect
Properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| EmbedmentDepth | Describes how deep a pile is embedded in meters. | double |
Inherited properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| Element | The bis:Element that owns this bis:ElementUniqueAspect | navigation |
PipeAspect EntityClass
An aspect that defines the basic measurements of a pipe.
Base Class: QuantityTakeoffsAspects:QuantityTakeoffAspect
Properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| Diameter | Diameter of a pipe in meters. | double | |
| Length | Length of a pipe in meters. | double | |
| Schedule | Schedule of a pipe. The schedule number on a pipe relates to the thickness of the wall on the pipe. | string | |
| Thickness | Thickness of a pipe in meters. | double |
Inherited properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| Element | The bis:Element that owns this bis:ElementUniqueAspect | navigation |
QuantityTakeoffAspect Abstract EntityClass
An abstract aspect that contains detailed measurement of materials and labor needed to complete a construction project.
Base Class: BisCore:ElementUniqueAspect
Inherited properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| Element | The bis:Element that owns this bis:ElementUniqueAspect | navigation |
SideAreasAspect (Side-areas Aspect) EntityClass
An aspect that defines the area measurements for the different sides of a three dimensional object.
Base Class: QuantityTakeoffsAspects:QuantityTakeoffAspect
Properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| BottomGrossArea | Total surface area of the bottom side. | double | |
| BottomNetArea | Usable surface area of the bottom side. | double | |
| LeftSideGrossArea | Total surface area of the left side. | double | |
| LeftSideNetArea | Usable surface area of the left side. | double | |
| RightSideGrossArea | Total surface area of the right side. | double | |
| RightSideNetArea | Usable surface area of the right side. | double | |
| TopGrossArea | Total surface area of the top side. | double | |
| TopNetArea | Usable surface area of the top side. | double |
Inherited properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| Element | The bis:Element that owns this bis:ElementUniqueAspect | navigation |
SlabAspect EntityClass
An aspect that describes the properties of a large, flat piece of concrete or stone - slab.
Base Class: QuantityTakeoffsAspects:QuantityTakeoffAspect
Properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| SlabDirection | Describes in which direction is a slab supported. | SlabDirectionType | |
| Type | Type of a slab. | SlabType |
Inherited properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| Element | The bis:Element that owns this bis:ElementUniqueAspect | navigation |
SlopeAspect (Slope) EntityClass
An aspect that defines the angle of a slope.
Base Class: QuantityTakeoffsAspects:QuantityTakeoffAspect
Properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| Slope | Angle of a slope in radians. | double |
Inherited properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| Element | The bis:Element that owns this bis:ElementUniqueAspect | navigation |
StairsAspect EntityClass
An aspect that describes properties of stairs.
Base Class: QuantityTakeoffsAspects:QuantityTakeoffAspect
Properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| NumberOfRisers | Number of steps/risers in the stairs. | int | |
| RiserHeight | Height of a riser, distance between steps. | double |
Inherited properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| Element | The bis:Element that owns this bis:ElementUniqueAspect | navigation |
StructuralLinearMemberAspect EntityClass
An aspect that describes a straight structural member.
Base Class: QuantityTakeoffsAspects:QuantityTakeoffAspect
Properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| CrossSectionalArea | Cross-Sectional area of a structural member. | double | |
| SectionName | Name of a structural member. | string | |
| Type | Type of a structural member. | StructuralFramingType |
Inherited properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| Element | The bis:Element that owns this bis:ElementUniqueAspect | navigation |
SurfaceAreaAspect (Surface-area Aspect) EntityClass
An aspect that defines gross and net surface area measurements.
Base Class: QuantityTakeoffsAspects:QuantityTakeoffAspect
Properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| GrossSurfaceArea | Total surface area. | double | |
| NetSurfaceArea | Usable surface area. | double |
Inherited properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| Element | The bis:Element that owns this bis:ElementUniqueAspect | navigation |
ThicknessAspect (Thickness Aspect) EntityClass
An aspect that defines object's thickness.
Base Class: QuantityTakeoffsAspects:QuantityTakeoffAspect
Properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| Thickness | Thickness of an object in meters. | double |
Inherited properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| Element | The bis:Element that owns this bis:ElementUniqueAspect | navigation |
VolumeAspect (Volume Aspect) EntityClass
An aspect that defines gross and net volumes of an object.
Base Class: QuantityTakeoffsAspects:QuantityTakeoffAspect
Properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| GrossVolume | Total volume of an object with packaging. | double | |
| NetVolume | Volume of an object alone. | double |
Inherited properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| Element | The bis:Element that owns this bis:ElementUniqueAspect | navigation |
WallAspect EntityClass
An aspect that describes the wall type.
Base Class: QuantityTakeoffsAspects:QuantityTakeoffAspect
Properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| Type | Type of a wall. | WallType |
Inherited properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| Element | The bis:Element that owns this bis:ElementUniqueAspect | navigation |
WindowAspect EntityClass Deprecated
An aspect that describes the window type.
Base Class: QuantityTakeoffsAspects:QuantityTakeoffAspect
Properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| Type | Type of a window. | WindowType |
Inherited properties
| Name | Description | Type | Extended Type |
|---|---|---|---|
| Element | The bis:Element that owns this bis:ElementUniqueAspect | navigation |
Relationship Classes
ElementOwnsDimensionsAspect RelationshipClass
A relationship tieing the specialized quantity takeoff aspect with an element
Base Class: QuantityTakeoffsAspects:ElementOwnsQuantityTakeOffAspect
Strength: Embedding
Strength Direction: Forward
Source
Target
ElementOwnsDoorAspect RelationshipClass Deprecated
A relationship tieing the specialized quantity takeoff aspect with an element
Base Class: QuantityTakeoffsAspects:ElementOwnsQuantityTakeOffAspect
Strength: Embedding
Strength Direction: Forward
Source
Target
ElementOwnsEnergyPerformanceAspect RelationshipClass
A relationship tieing the specialized quantity takeoff aspect with an element
Base Class: QuantityTakeoffsAspects:ElementOwnsQuantityTakeOffAspect
Strength: Embedding
Strength Direction: Forward
Source
Target
ElementOwnsFoundationAspect RelationshipClass
A relationship tieing the specialized quantity takeoff aspect with an element
Base Class: QuantityTakeoffsAspects:ElementOwnsQuantityTakeOffAspect
Strength: Embedding
Strength Direction: Forward
Source
Target
ElementOwnsMaterialAspect RelationshipClass Deprecated
A relationship tieing the specialized quantity takeoff aspect with an element
Base Class: QuantityTakeoffsAspects:ElementOwnsQuantityTakeOffAspect
Strength: Embedding
Strength Direction: Forward
Source
Target
ElementOwnsPerimeterAspect RelationshipClass
A relationship tieing the specialized quantity takeoff aspect with an element
Base Class: QuantityTakeoffsAspects:ElementOwnsQuantityTakeOffAspect
Strength: Embedding
Strength Direction: Forward
Source
Target
ElementOwnsPileAspect RelationshipClass
A relationship tieing the specialized quantity takeoff aspect with an element
Base Class: QuantityTakeoffsAspects:ElementOwnsQuantityTakeOffAspect
Strength: Embedding
Strength Direction: Forward
Source
Target
ElementOwnsPipeAspect RelationshipClass
A relationship tieing the specialized quantity takeoff aspect with an element
Base Class: QuantityTakeoffsAspects:ElementOwnsQuantityTakeOffAspect
Strength: Embedding
Strength Direction: Forward
Source
Target
ElementOwnsQuantityTakeOffAspect RelationshipClass
Element may own one or more quantitytakeoffaspects
Base Class: BisCore:ElementOwnsUniqueAspect
Strength: Embedding
Strength Direction: Forward
Source
Target
ElementOwnsSideAreasAspect RelationshipClass
A relationship tieing the specialized quantity takeoff aspect with an element
Base Class: QuantityTakeoffsAspects:ElementOwnsQuantityTakeOffAspect
Strength: Embedding
Strength Direction: Forward
Source
Target
ElementOwnsSlabAspect RelationshipClass
A relationship tieing the specialized quantity takeoff aspect with an element
Base Class: QuantityTakeoffsAspects:ElementOwnsQuantityTakeOffAspect
Strength: Embedding
Strength Direction: Forward
Source
Target
ElementOwnsSlopeAspect RelationshipClass
A relationship tieing the specialized quantity takeoff aspect with an element
Base Class: QuantityTakeoffsAspects:ElementOwnsQuantityTakeOffAspect
Strength: Embedding
Strength Direction: Forward
Source
Target
ElementOwnsStairsAspect RelationshipClass
A relationship tieing the specialized quantity takeoff aspect with an element
Base Class: QuantityTakeoffsAspects:ElementOwnsQuantityTakeOffAspect
Strength: Embedding
Strength Direction: Forward
Source
Target
ElementOwnsStructuralLinearMemberAspect RelationshipClass
A relationship tieing the specialized quantity takeoff aspect with an element
Base Class: QuantityTakeoffsAspects:ElementOwnsQuantityTakeOffAspect
Strength: Embedding
Strength Direction: Forward
Source
Target
ElementOwnsSurfaceAreaAspect RelationshipClass
A relationship tieing the specialized quantity takeoff aspect with an element
Base Class: QuantityTakeoffsAspects:ElementOwnsQuantityTakeOffAspect
Strength: Embedding
Strength Direction: Forward
Source
Target
ElementOwnsThicknessAspect RelationshipClass
A relationship tieing the specialized quantity takeoff aspect with an element
Base Class: QuantityTakeoffsAspects:ElementOwnsQuantityTakeOffAspect
Strength: Embedding
Strength Direction: Forward
Source
Target
ElementOwnsVolumeAspect RelationshipClass
A relationship tieing the specialized quantity takeoff aspect with an element
Base Class: QuantityTakeoffsAspects:ElementOwnsQuantityTakeOffAspect
Strength: Embedding
Strength Direction: Forward
Source
Target
ElementOwnsWallAspect RelationshipClass
A relationship tieing the specialized quantity takeoff aspect with an element
Base Class: QuantityTakeoffsAspects:ElementOwnsQuantityTakeOffAspect
Strength: Embedding
Strength Direction: Forward
Source
Target
ElementOwnsWindowAspect RelationshipClass Deprecated
A relationship tieing the specialized quantity takeoff aspect with an element
Base Class: QuantityTakeoffsAspects:ElementOwnsQuantityTakeOffAspect
Strength: Embedding
Strength Direction: Forward
Source
Target
Enumerations
DoorType Enumeration
Backing Type: int
Strict: true
| Label | Value | Description |
|---|---|---|
| Flush | 0 | |
| Full Glass | 1 | |
| Half Glass | 2 | |
| 2 Lite | 3 | |
| Narrow View | 4 | |
| View | 5 | |
| Louver - Full | 6 | |
| Louver - Bottom | 7 | |
| Louver - Top | 8 | |
| Half Glass w/ Louver | 9 | |
| Narrow View w/ Louver | 10 |
FoundationType Enumeration
Backing Type: int
Strict: true
| Label | Value | Description |
|---|---|---|
| Mat Foundation | 0 | |
| Pile | 1 | |
| Pile Cap | 2 | |
| Spread Footing | 3 | |
| Strip Footing | 4 |
SlabDirectionType Enumeration
Backing Type: int
Strict: true
| Label | Value | Description |
|---|---|---|
| Unknown | 0 | |
| One Way | 1 | |
| Two Way | 2 |
SlabType Enumeration
Backing Type: int
Strict: true
| Label | Value | Description |
|---|---|---|
| Floor | 0 | |
| Roof | 1 | |
| Landing | 2 | |
| Base Slab | 3 | |
| User Defined | 4 | |
| Not Defined | 5 |
StructuralFramingType Enumeration
Backing Type: int
Strict: true
| Label | Value | Description |
|---|---|---|
| Beam | 0 | |
| Column | 1 | |
| Vertical Brace | 2 | |
| Horizontal Brace | 3 | |
| Pier | 4 | |
| Pile | 5 | |
| Purlin | 6 | |
| Cladding | 7 |
WallType Enumeration
Backing Type: int
Strict: true
| Label | Value | Description |
|---|---|---|
| Movable | 0 | |
| Parapet | 1 | |
| Partitioning | 2 | |
| Plumbing Wall | 3 | |
| Shear | 4 | |
| Solid Wall | 5 | |
| Standard | 6 | |
| Polygonal | 7 | |
| Elemented Wall | 8 | |
| User Defined | 9 | |
| Not Defined | 10 |
WindowType Enumeration
Backing Type: int
Strict: true
| Label | Value | Description |
|---|---|---|
| Casement | 0 | |
| Single Hung | 1 | |
| Double Hung | 2 | |
| Awning | 3 | |
| Hopper | 4 | |
| Sliding | 5 |
Last Updated: 10 June, 2025