Schemas may be single-instance or relocatable. Single-instance
schemas correspond to exactly one set of keys in the backend
database: those located at the path returned by this function.
Relocatable schemas can be referenced by other schemas and can
therefore describe multiple sets of keys at different locations. For
relocatable schemas, this function will return NULL.
Gets the path associated with schema, or NULL.
Schemas may be single-instance or relocatable. Single-instance schemas correspond to exactly one set of keys in the backend database: those located at the path returned by this function.
Relocatable schemas can be referenced by other schemas and can therefore describe multiple sets of keys at different locations. For relocatable schemas, this function will return NULL.