The DEXPI Specification

The full DEXPI specification is available in version 1.3.
More info:
DEXPI Information model

These pages provide an alternative access to the DEXPI Information Model described in the DEXPI P&ID Specification 1.2 from 2017-05-20.
The model is available on a SPARQL server similar to the DEXPI sandbox.
More info: DEXPI Information model
Proteus XML schema

The schema is based on XSD and an provides the syntactic description for XML-files to be used for the import and export of piping and instrumentation diagrams.
More info: Proteus Schema for P&ID Exchange
OPC-UA Companion Specifcation

This specification is under active development and will ensure te compatibility of DEXPI and OPC UA and allow data transfers.
More info: OPC-UA Companion Specifcation
Exemplary Process and Instrumentation Diagram

The DEXPI group has agreed about the concentration on a first exemplary Process and Instrumentation Diagram for the application of data exchange.
It is based on ISO 10628:

Other example P&IDs are also available on GitLab.