A unique identifier for a Datastore entity. If a key's partition ID or any of its path kinds or names are reserved/read-only, the key is reserved/read-only. A reserved/read-only key is forbidden in certain documented contexts.
The entity path. An entity path consists of one or more elements composed of a kind and a string or numerical identifier, which identify entities. The first element identifies a root entity, the second element identifies a child of the root entity, the third element identifies a child of the second entity, and so forth. The entities identified by all prefixes of the path are called the element's ancestors. A path can never be empty, and a path can have at most 100 elements.
Classes
PathElement
A (kind, ID/name) pair used to construct a key path.
If either name or ID is set, the element is complete. If neither is set, the element is incomplete.
The type of ID.
The name of the entity. A name matching regex __.*__ is
reserved/read-only. A name must not be more than 1500 bytes
when UTF-8 encoded. Cannot be "".