169 enhance the model section (#219)

* Update model.md

* Splitting to not-normative and normative part
* adding  description on registry

* Fix formatting

* Update model.md

Adding intro text

* Update model/model.md

fixing typo

Co-authored-by: Jim Marino <jim.marino@gmail.com>

* Fix formatting

* Adding link to terminology

* Update model/model.md

Co-authored-by: Julia Pampus <72392527+juliapampus@users.noreply.github.com>

* update branch (#231)

* ci: fix typo for file check workflow (#215)

* ci: fix typo

* ci: remove duplicated workflow trigger

* Update context.json (#216)

* replace odrl:offer/odrl:agreement with dspace:offer/dspace:agreement (#221)

* extend explanation on dspace-trust child resources (#222)

* Replace providerId/consumerId with odrl:assigner / odrl:assignee (#213)

* replace providerId/consumerId with odrl:assigner / odrl:assignee

* replace providerId/consumerId in contract.negotiation.protocol

* fix the ToC in contract.negotiation.binding.https

* Update model documents (#229)

* Add pagination and filter changes (#228)

* Add pagination and filter changes

* Change continuation tokens

* Adds auth description to common bindings document (#227)

* Add description

* Remove auth sections

* Remove auth sections from catalog

* Remove subchapter on Versioning (#225)

* remove subchapter on versioning from the https binding

* fix table of content

* Cleanup `EndpointProperty` inconsistencies and specify `authType` (#218)

* Specify auth type property; clarify authorization property and make case consistent; remove incorrect bearer prefix; remove non-normative S3 reference

* Add descriptions

* Remove S3 reference

* Remove S3 reference

* Revert releases folder change

* Emphazising that the spec does not cover the data transfer (#230)

* Highlighting the text by formatting
* Adding further explanation

---------

Co-authored-by: Julia Pampus <72392527+juliapampus@users.noreply.github.com>
Co-authored-by: Maarten Kollenstart <maarten.kollenstart@tno.nl>
Co-authored-by: sebbader-sap <107036549+sebbader-sap@users.noreply.github.com>
Co-authored-by: Jim Marino <jim.marino@gmail.com>

* Merging definitions of dataspace registry

* Clarifing that the Rulebook content is non-normative and an example

* Update model/model.md

Co-authored-by: Jim Marino <jim.marino@gmail.com>

---------

Co-authored-by: Jim Marino <jim.marino@gmail.com>
Co-authored-by: Julia Pampus <72392527+juliapampus@users.noreply.github.com>
Co-authored-by: Maarten Kollenstart <maarten.kollenstart@tno.nl>
Co-authored-by: sebbader-sap <107036549+sebbader-sap@users.noreply.github.com>

model/model.md

@@ -3,9 +3,17 @@
 ## 2 Dataspace Information Model
 
 The following sections outline the Dataspace Information Model, which form the foundation of this specification.
+Some aspects of this section describe additional concepts of Dataspaces and provide context for the Dataspace Protocol,
+those are considered as non-normative. Further information on the functional requirements of a Dataspace can be found  for example in
+the [IDSA Rulebook](https://docs.internationaldataspaces.org/idsa-rulebook).
 
 ### 2.1 Dataspace Entity Relationships
 
+#### 2.1.1 Context of the Dataspace Protocol
+
+In a broader context, the Dataspace Protocol enables the interaction between participants of
+a Dataspace. This may require additional concepts, which are not in the scope of this specification.
+The definitions below are therefore informative and not-normative.
 The relationships between the primary [Dataspace](./terminology.md#dataspace) entities are defined as follows:
 
 ![](./m.dataspace.relationships.png)
@@ -19,6 +27,13 @@ Note that all relationships are multiplicities unless specified. `Dataspace Auth
 - An [Identity Provider](./terminology.md#identity-provider) is a trust anchor that generates `ID tokens` used to verify the identity of a [Participant Agent](./terminology.md#participant-agent). Multiple identity providers may operate in a [Dataspace](./terminology.md#dataspace). The types and semantics of ID tokens are not part of this specification. An [Identity Provider](./terminology.md#identity-provider) may be a third-party or a [Participant](./terminology.md#participant) itself (for example, in the case of decentralized identifiers).
 - A [Credential Issuer](./terminology.md#credential-issuer) issues _verifiable credentials_ used by [Participant Agents](./terminology.md#participant-agent) to allow access to [Datasets](./terminology.md#dataset) and verify usage control.
 
+Further non-normative information on the context of the Dataspace Protocol can be found for example in the [IDSA Rulebook](https://docs.internationaldataspaces.org/idsa-rulebook).
+
+#### 2.1.2 Dataspace Protocol specific
+
+The Dataspace Protocol shall enable the interactions between the [Participant Agents](./terminology.md#participant-agent) in a Dataspace.
+The following concepts are therefore normative.
+
 The diagram below depicts the relationships between [Participant Agent](./terminology.md#participant-agent) types:
 
 ![](./m.participant.entities.png)
@@ -28,38 +43,37 @@ The diagram below depicts the relationships between [Participant Agent](./termin
 - A [Dataset](./terminology.md#dataset) has **_at least one_** [Offer](./terminology.md#offer), which is an [ODRL Offer](https://www.w3.org/TR/odrl-model/#policy-offer) describing the [Usage Policy](./terminology.md#policy) associated with the [Dataset](./terminology.md#dataset).
 - A [Connector](./terminology.md#connector--data-service-) is a [Participant Agent](./terminology.md#participant-agent) that performs [Contract Negotiation](./terminology.md#contract-negotiation) and [Transfer Process](./terminology.md#transfer-process) operations with another [Connector](./terminology.md#connector--data-service-). An outcome of a [Contract Negotiation](./terminology.md#contract-negotiation) may be the production of an [Agreement](./terminology.md#agreement), which is an [ODRL Agreement](https://www.w3.org/TR/odrl-model/#policy-agreement) defining the [Usage Policy](./terminology.md#policy) agreed to for a [Dataset](./terminology.md#dataset).
 
-## 2.2 Classes
+### 2.2 Classes
 
 Not all [Dataspace](./terminology.md#dataspace) entities have a concrete _technical_ materialization; some entities may exist as purely logical constructs. For example, a [Dataspace Authority](./terminology.md#dataspace-authority) and a [Participant Agent](./terminology.md#participant-agent) have no representation in the protocol message flows that constitute [Dataspace](./terminology.md#dataspace) interactions. This section outlines the classes that comprise the concrete elements of the model, i.e., those that are represented in protocol message flows.
 
 **_Note 1:_**
 The classes and definitions used in the Dataspace Protocol are reused from different standards and specifications as much as possible, in particular, [DCAT](https://www.w3.org/TR/vocab-dcat-3) and [ODRL](https://www.w3.org/TR/odrl/). As, however, the external definitions allow different interpretations or provide more attributes than required, the Dataspace Protocol is leveraging _profiles_ of the original definitions rather than the complete original expressiveness. A _profile_ in this sense is a restriction or subset of an external definition, enforcing that every occurrence of an externally defined class is always conformant with the original definition. However, not every standard-compliant class might be compliant to the dataspace profile.
 
-### 2.2.1 Catalog
+#### 2.2.1 Catalog
 
 A [Catalog](./terminology.md#catalog) is a [DCAT Catalog](https://www.w3.org/TR/vocab-dcat-3/#Class:Catalog) with the following attributes:
 
 - 0..N [Datasets](./terminology.md#dataset). Since a [Catalog](./terminology.md#catalog) may be dynamically generated for a request based on the requesting [Participant's](./terminology.md#participant) credentials it is possible for it to contain 0 matching [Datasets](./terminology.md#dataset). (DCAT PROFILE)
 - 1..N [DCAT DataService](https://www.w3.org/TR/vocab-dcat-3/#Class:Data_Service) that references a [Connector](./terminology.md#connector--data-service-) where [Datasets](./terminology.md#dataset) may be obtained. (DCAT PROFILE)
 
-### 2.2.2 Dataset
+#### 2.2.2 Dataset
 
 A [Dataset](./terminology.md#dataset) is a [DCAT Dataset](https://www.w3.org/TR/vocab-dcat-3/#Class:Dataset) with the following attributes:
 
 - 1..N `hasPolicy` attributes that contain an [ODRL `Offer`](https://www.w3.org/TR/odrl-vocab/#term-Offer) defining the [Usage Policy](./terminology.md#policy) associated with the [Dataset](./terminology.md#dataset). **_Offers must NOT contain any target attributes. The target of an [Offer](./terminology.md#offer) is the associated [Dataset](./terminology.md#dataset)._** (ODRL PROFILE)
 - 1..N [DCAT Distributions](https://www.w3.org/TR/vocab-dcat-3/#Class:Distribution). Each distribution must have at least one `DataService` which specifies where the distribution
   is obtained. Specifically, a `DataService` specifies the endpoint for initiating a [Contract Negotiation](./terminology.md#contract-negotiation) and [Transfer Process](./terminology.md#transfer-process). (DCAT PROFILE)
 
-### 2.2.3 Offer
+#### 2.2.3 Offer
 
 An [Offer](./terminology.md#offer) is an [ODRL Offer](https://www.w3.org/TR/odrl-model/#policy-offer) with the following attributes:
 
 - An ODRL `uid` is represented as an "@id" that is a unique identifier. (ODRL PROFILE)
 - The [Offer](./terminology.md#offer) must be unique to a [Dataset](./terminology.md#dataset) since the target of the [Offer](./terminology.md#offer) is derived from its enclosing context.
 - The value of the `target` attribute is the dataset id. Except if the [Offer][Catalog](./terminology.md#offer) is used in an enclosing [Catalog](./terminology.md#catalog) or [Dataset](./terminology.md#dataset), then the there must not be any `target` attribute set.
 
-
-## 2.2.4 Agreement
+#### 2.2.4 Agreement
 
 An [Agreement](./terminology.md#agreement) is an [ODRL Agreement](https://www.w3.org/TR/odrl-model/#policy-agreement) with the following attributes: