Layered topic map

Layered topic map also called layer stack is a special topic map construct that combines multiple separate topic maps into a single topic map. You may think layer stack as a folder that merges all including topic maps. Typically layer stacks are used to collect dependent topic maps under a single label. Layer stacks can build up a nested folder structure i.e. layer stack can contain layer stacks.

In order to write into a layer stack, the stack must contain at least one real topic map implementation, memory topic map for example.

See also Introduction to Layered Topic Maps.