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+# Interface summary
+
+## General
+
+### org.simantics.Simantics
+
+This static class can be used to obtain the active Session.
+
+### org.simantics.db.Session
+
+The Session interface represents the connection into the semantic database. Implements e.g. `RequestProcessor` and serves various special interfaces via the `getService`-method.
+
+## Reading and writing
+
+### org.simantics.db.RequestProcessor
+
+`RequestProcessor` is a synchronous interface for making read queries and writes to the semantic database. Main implementations are `Session`, `ReadGraph` and `WriteGraph`.
+
+### org.simantics.db.Read
+
+The interface Read represents a query, which produces a single result. Main implementations are `ResourceRead*` and `*naryRead`.
+
+### org.simantics.db.Write
+
+The interface `Write` represents a modification into the semantic database. Main implementation is `WriteRequest`.