1.1 KiB
The Graph
iD implements a persistent data structure over the OSM data model.
To be clear, this data model is something like
root -> relations (-> relations) -> ways -> nodes
\ \> nodes
\- ways -> nodes
\- nodes
Actions
Actions are operations on OSM data like adding nodes, moving ways,
and so on. They are initiated by controller states, like
iD.controller.ControllerState initiates a CreatePOIAction and
adds it to the undo stack.
Entities
iD.Entity is the door from pure objects like iD.Node into a hierarchy
of objects - it provides handling of parents, children, and so on.
loaded
The .loaded member of nodes and ways is because of relations,
which refer to elements, so we want to have real references of those
elements, but we don't have the data yet. Thus when the Connection
encounters a new object but has a non-loaded representation of it,
the non-loaded version is replaced.