Diffing_Engine: review the structure/organisation of the identifiers
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@alelom 已经在做这个了。
开始于 2020年7月9日。
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type:question
| Category | |
|---|---|
| Persistent | The id is a GUID generated upon object creation. If the object is modified, this id is transferred to the new instance of the object. |
| Instance | if any property of the object changes, the id changes. |
| Name | Type (Persistent or instance) | Example | Description |
|---|---|---|---|
| External Id (or "Adapter Id") | (Depends on software) | A number | The id assigned to the object by the external software. This may or may not be unique per se (e.g. could be unique within a certain category, but not in absolute sense). Example: in robot, a bar is assigned a progressive number starting from 1; nodes too. |
| Instance External Id | Instance | a guid or hash | An id assigned to the object by the external software that is unique for that object and its defining properties. The object, if modified, will get a different id of this type. Example: in Robot, this can be obtained by the combination of the object Type (e.g. Robot.Bar) with its External Id (e.g. `1). |
| Persistent External Id | Persistent | a guid | An id assigned to the object by the external software that is unique for that object. Persistent = remains the same if the object is modified; it is generated only once upon object creation. Example: in Revit, the UniqueId. |
| BHoM Guid | Persistent | a guid | The BHoM Guid is generated once upon object instantiation. If the object is modified, the Guid is transferred to the new object. |
| BHoM Hash | Instance | a hash | An id that uniquely identifies an object with all its properties set to a certain value. If any property is modified, this id changes. |
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