# Interface BimChangeIfc

Represents a change for a IFC file

interface BimChangeIfc {
apiUrl: string;
availableLayerDefinitions: LayerDefinitions;
blobId: string;
classes: ModelProductClass[];
containerId: string;
discipline: Discipline;
etag: string;
floors: IfcFloor[];
format: string;
id: string;
metadata: BimChangeIfcMetadata & BimChangeBaseMetadata;
name: string;
ownerSystem: string;
path: string;
permissions: Permissions;
permissionsString: string;
productCount: number;
resourceUrl: HttpIfcResourceUrls;
type: BlobWithGeometry;
url: string;
version: number;
}

#### Hierarchy (View Summary)

- BimChangeBase
- HttpIfcResource
- Required<BimChangeDiscipline>
- AvailableLayerDefinitions
- ContentUrl
  - BimChangeIfc
    - IfcWithOptions

##### Index

### Properties

apiUrl
availableLayerDefinitions
blobId
classes
containerId
discipline
etag
floors
format
id
metadata
name
ownerSystem
path
permissions
permissionsString
productCount
resourceUrl
type
url
version

## Properties

### `Readonly` apiUrl

apiUrl: string

Contains base API URL to use when calling backend methods for this particular item.

Inherited from BimChangeBase.apiUrl

### `Readonly` availableLayerDefinitions

availableLayerDefinitions: LayerDefinitions

List of layers, that can be added to this change, together with the permission that the current user has for each of them.

Inherited from AvailableLayerDefinitions.availableLayerDefinitions

### `Readonly` blobId

blobId: string

Id of blob that contains the geometry

### `Readonly` classes

classes: ModelProductClass[]

Set of IfcClasses available in the IFC file

### `Readonly` containerId

containerId: string

Id of BimContainer to which this change belongs.

Inherited from BimChangeBase.containerId

### `Readonly` discipline

discipline: Discipline

Discipline. Example A, K, V etc

Inherited from Required.discipline

### `Readonly` etag

etag: string

etag for change. Used for optimistic concurrency checks and in operations where we want to check if data has changed or not since last etag we have.

Inherited from BimChangeBase.etag

### `Readonly` floors

floors: IfcFloor[]

Floors (IfcBuildingStorey) available in IFC file

### `Readonly` format

format: string

Format of change.

Inherited from BimChangeBase.format

### `Readonly` id

id: string

Id of change.

Inherited from BimChangeBase.id

### `Readonly` metadata

metadata: BimChangeIfcMetadata & BimChangeBaseMetadata

IFC change metadata.

Overrides BimChangeBase.metadata

### `Readonly` name

name: string

Name of change.

Inherited from BimChangeBase.name

### `Readonly` ownerSystem

ownerSystem: string

Id of system that the change originated from. If a change in Twinfinity was created because an external system pushed it into Twinfinity then the id will refer to that system. If change originates from Twinfinity (for example because a file was uploaded by a user) then the id will always be 'twinfinity'.

Inherited from BimChangeBase.ownerSystem

### `Readonly` path

path: string

Unique path for the change. Each change has one. If the change or one of its parents are renamed then the path will change.

Inherited from BimChangeBase.path

### `Readonly` permissions

permissions: Permissions

64 bit permission bitmask. Used to verify that a user has required permissions on a change. Since there is no native JSON support for bitmasks, the value is derived from permissionsString.

Inherited from BimChangeBase.permissions

### `Readonly` permissionsString

permissionsString: string

String used to represent the permissions bitmask.

Inherited from BimChangeBase.permissionsString

### `Readonly` productCount

productCount: number

Number of IFC products available in this change

### `Readonly` resourceUrl

resourceUrl: HttpIfcResourceUrls

Urls of .idx, .geom and .prop files available for the .ifc file.

Inherited from HttpIfcResource.resourceUrl

### `Readonly` type

type: BlobWithGeometry

Indicates that we have a change with ifc

### `Readonly` url

url: string

URL of change content. Points to the endpoint where the content of the change can be retrieved by a simple GET request.

Inherited from ContentUrl.url

### `Readonly` version

version: number

Version of change

Inherited from BimChangeBase.version