What's New

Version 1.2 introduces the following incremental changes from version 1.1:

Enhancements for Type messages:

• Ability to support type resuse using reftypeid defined on a Type Properties and Formats within a Type message.

• Addition of the enum keyword defined on a Type Messages, used to create a reusable set of allowed values, and reference it as the datatype for a Type Properties and Formats using reftypeid.

• Support for extrapolation mode on the type, used to categorize the behavior of data being stored in instances.

• Ability to designate a property as holding data quality using isquality defined on a Type Properties and Formats.

• Support for minimum and maximum type qualifiers defined on a Type Properties and Formats.

• Support for interpolation mode defined on a Type Properties and Formats, used to categorize the behavior of data being stored in properties.

• Simplified type delete messages requiring only typeid

Enhancements for Container messages:

• Ability to override values of properties defined by a dynamic Type using the propertyoverrides keyword in the Container Messages. Currently supported property overrides include name, description, uom, minimum, maximum, and interpolation.

• Ability to set the source of a stream of data using the datasource keyword defined on a Container Messages.

• Support for extrapolation mode on the container, used to categorize the behavior of data being stored and override the type 'extrapolation' setting.

• Simplified container delete messages requiring containerid and typeid

Enhancements for Data messages:

• Addition of the property keyword in the Link Data Messages Data Message used to link Types and Instances of Types to a particular property.

• When linking to properties, the link can be defined by property to property, or defined by property to Type.

• Support for type-less static data values to be sent in a Data Message using the new keyword Data Messages within the Data Message.

• Simplified delete messages for static types which require only indexes

Deprecated Features in OMF v1.2 specification:

• Specifying the version of a type when it is referenced is no longer supported. Types are considered immutable and can be referenced by their typeid alone.

• The producertoken field in the message header has been obsoleted, and is no longer supported.

Rename

• "OMF" was renamed to "Open Message Format" from "OSIsoft Message Format".