The service supports the retrieval of AIXM 5.1 features. All temporal operators described in OGC Web Feature Service (WFS) Temporality Extension (Doc nr OGC 12-027r3) are supported.
Restriction: the interpretation cannot be SNAPSHOT if temporal filters are used.
Reference
OGC Web Feature Service (WFS) Temporality Extension
https://portal.opengeospatial.org/files/?artifact_id=58922