...
The motivation to do this is that without an ability to filter Compostions, the current GET calls are not very useful to developers, e.g. to do obvious things like obtaining last month of BPs.
See https://github.com/openEHR/specifications-ITS/issues/31 for more discussion.
Design Notes
This might be implemented with some 'canned query' calls, which might actually be implemented with standard AQL, and whose semantics could be expressed as AQL equivalents at the specification level.
...