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Based on the considerations of the concept group, OpenSCENARIO 2.0 is proposed to be founded on the concept of a domain-specific language (see Methodology and Language Concepts chapters in the concept document), that should support all levels of scenario description, from the very abstract to the very concrete in a suitable way.

The OpenSCENARIO 2.0 concepts take proven features and capabilities of OpenSCENARIO 1.0, like its event-based scenario execution model, and place them in a more general and expressive language framework, to serve as the foundation for both incremental improvements and more revolutionary enhancements.

In comparison to OpenSCENARIO 1.0, a more detailed set of actions and attributes for the relevant simulation models shall be defined to allow for a more comprehensive scenario description and to improve exchangeability. This is addressed by the introduction of a domain model (see Concept document chapter: Architecture).

Beyond such improvements, the proposed domain-specific language supports the creation of more complex scenarios through flexible composition and parametrization of component scenarios in ways that allow realistic, emergent behavior to occur. This is expected to enable massive testing and verification of new, complex hardware and software systems, and their interaction with the complex environment of driving.

The concept group believes that the proposed concepts and direction will enable OpenSCENARIO 2.0 to supply a step-function in its ability to describe full, complex simulations and/or tests, addressing all the required elements, and utilizing existing building blocks (like OpenDRIVE or OpenCRG).

As stated above, the foundational concept of OpenSCENARIO 2.0 is to establish a domain specific language of a declarative nature. A declarative language describes what should happen on scenario execution (including the required parameterization/variation), rather than how to do it. A declarative language can also have a _dual interpretation_, i.e. provide a single scenario description which can be used to describe both how to make it and how to monitor that it _indeed_ happened. This is important if we want to condition some operation on the fact that some other scenario has happened before, without having to describe in detail _how_ to cause that scenario.


The Concept document is using M-SDL language to demonstrate all the concept. It is expected to examine if this language can serve as the foundation of the standards.

Provide a detailed description, how the identified usecases, features or issues (as per preceding chapter) shall be solved or implemented through the proposed project. Descriptions shall include, if applicable:

* Components of a system, which shall be standardized
* Features or functionality of the standardized components
* Method of standardization
* Potentially donated IP from member companies
* Toplevel requirements to be considered for developing the standard
* Statements about backwardcompatibility towards earlier versions of the standard
* Improvements & benefits of the changes as compared to earlier releases of the standard
* Assumptions

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The technical content description shall be understandable for readers with an engineering background, but with no specific domainexpertise. Consequently, a brief technical introduction may be needed.

==== Domain Model

===== Entity Definition 
Responsibles for filling this sub-chapter: J. Tscheak (maybe), M. Kluge, J.Kaths, F. Bock (maybe), S. Rosenberg (maybe)
WP DM-Transfer1x - Rework Entity Definition from Concept project with regard to OSC 1.0
overhaul entity definition with regard to OSC 1.0 (maybe Jupp Tscheak, Michael, Jakob)
    * identify deviations
    * clarify if deviations are necessary or should
    * clarify naming / terminology
    * create a mapping where necessary

WP DM-Extend2x - Extend Entity Definition from Concept project and from WP DM-Transfer1x towards OSC 2.0
identify entities and their actions / methods that are introduced by high-level description of OSC 2.0 (so not part of OSC 1.0) (maybe Florian Bock, Michael Kluge, Jakob Kaths, maybe Sharon Rosenberg)
    * identify new entities, their actions and attributes that are necessary to cover high-level scenario descriptions in OSC 2.0 (e.g. Road, drive(), etc.)
    * integrate them properly in Domain Model
    * close interrelation on working-level with language group (was a lack during concept phase)

===== Extensibility 
Responsibles for filling this sub-chapter: S. Rosenberg, H. Bothe (maybe)
WP DM-Extensibility - Develop technical concept for extensibility of Domain Model
    * check with OTX where there are working groups for extensions (more firm extensions in line with Michael's (dSPACE) proposal)
    * feature sets may add parts to the domain model
    * "quick" extensions by (even single) users need to be possible as well
    * possibly introduce mandatory / optional
    * align with WP modules, libraries, etc.

===== Ontology
Responsibles for filling this sub-chapter: F. Sanchez, I. Whiteside, P. Parekh, S. Kraines (maybe), M. Nieto (maybe)
WP DM-Ontology - Develop ontology to establish relations between entities
    * synchronize with global ontology developed by ASAM
    * what are the technical artifacts that come out of the ontology development
    * Fran (FiveAI) can contribute, FiveAI developed own ontology for scenario description
    * Iain Whiteside (FiveAI) can provide a presentation on practical usage of their ontology
    * UK has developed a standard (or a PAS really) called 1883 for a driving ontology (Siddhartha could help here)
    * possible input as well from Steven and Florian Bock (Audi)
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==== Language Concepts
 
===== Semantics, syntax and structure






Finally, the overall semantics of the language should be clearly and unambigously defined. In order to achieve this, it is important to define how behavior is specified by combining actors, actions, modifiers and events to atomic phases and how possible semantic unambiguities are resolved. This also includes how conditions can be used to define events (e.g. raising/falling edge, etc) and which expressiveness we allow (compared e.g. to temporal logic languages).

Also included is the definition of the exact semantics of temporal composition operators like serial, parallel and mix. Another important aspect is how to combine the two different approaches of specifying behavior: a) the declarative way (like intended for OpenScenario 2.0) and b) the more execution/command-oriented way of OpenScenario 1.0 (that still should be supported)."