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Release: Jupiter (preview)

CX-0045 Aspect Model Data Chain Template v1.3.0

ABSTRACT​

This component of the capability Cross Company Data Chain Management is a data model, so that the Item Relationship Service API, and other applications can work not only on existing semantic models, but also, to new defined data chain relevant aspect models which fit to the template. With this model template in place, interoperability is being provided, because participants defining their connection between digital twins according to that template, will be able to access connected data. A data chain is a chain of linked data. The minimal set of information necessary to build this are two objects and one link between those objects. Objects in Catena-X are called Asset Administration Shell (AAS) or digital twins and linked digital twins are data chains. This template describes the minimal information of a link between two digital twins, so the most flexibility is given for further use-cases to build use-case specific data chains.

FOR WHOM IS THE STANDARD DESIGNED​

COMPARISON WITH THE PREVIOUS VERSION OF THE STANDARD​

Relevant only for existing standards. At the new standard, please delete

1 INTRODUCTION​

This component is used to standardize the way in which an aspect model of a digital twin needs to be modelled, so that services and products which consume linked data can work and that an interoperability on data chain level can exist. It is a minimal set of conditions to be applied to such aspect models that model a connection between two digital twins. This minimal set of conditions shall guide developer of new services and semantic models in the process of creating new solutions for Catena-X. It is an easy extendable template to fit the use-case needs.

1.1 AUDIENCE & SCOPE​

This section is non-normative

List for which roles the standard is relevant.

  • Core Service Provider
  • Data Provider
  • Business Application Provider
  • Enablement Service Provider
  • Consulting Provider

This standard is only applicable when a use-case has the need to extend existing Aspect Models with models connecting several Digital Twins. When a use-case has the need to extend the existing Aspect Models with models which connect several Digital Twins with each other. Then this standard applies. A so-called Data Chain exists when multiple Digital Twins are semantically connected to each other. For example, a Bill of Materials (BoM) Structure, where each part results in a separate Digital Twin. To have the same structure on how Data Chains can be built this template applies. This provides a lean structure that can be extended with Use-Case specific information and attributes.

This standard is only to be applied in the creation process of new aspect models, which connects digital twins in the Catena-X Network.

1.2 CONTEXT AND ARCHITECTURE FIT​

This section is non-normative

The following dependencies and preconditions exist. This aspect model template is written in SAMM 2.0 as a modeling language, which is an industry standard from the Eclipse Semantic Modelling Framework.

SAMM is used to model Asset Administration Shell submodels, which are attached to digital twins in the form of an Asset Administration Shell (AAS). All submodels in Catena-X are managed in the semantic hub https://github.com/eclipse-tractusx/sldt-semantic-hub. A data model is requested and exchanged via Catena-X using an Eclipse Dataspace Connector (see chapter 3.1 NORMATIVE REFERENCES), which is a separate Catena-X standard. An EDC is discovered by the EDC Discovery Flow (see chapter 3.1 NORMATIVE REFERENCES).

The following preconditions must be met that a developer is bound to use this template as reference:

  • The to be developed semantic model describes a data chain (e.g., linking one digital twin with another)
  • The to be developed semantic model is used or meant to be accessed by multiple use-cases.

1.3 CONFORMANCE AND PROOF OF CONFORMITY​

This section is non-normative

All participants and their solutions will need to prove, that they are conform with the Catena-X standards. To validate that the standards are applied correctly, Catena-X employs Conformity Assessment Bodies (CABs).

To prove conformity with the Data Chain Template, use the schema (see Chapter 2.1.1 JSON Schema) and check if the necessary structure is implicitly in the Aspect to prove. What is necessary:

  • The Object structure MUST match the template, but MAY contain more attributes
  • see chapter 2 DATA CHAIN ASPECT TEMPLATE for more conformity assessment criteria

1.4 EXAMPLES​

The JSON schema describes the schema of the template. The following examples show minimal setups of this template.

{
    "catenaXId": "urn:uuid:055c1128-0375-47c8-98de-7cf802c3241d",
    "childItems": [
        {
            "catenaXId": "urn:uuid:7BeA9fAE-A1ca-D164-3BDF-0E5bac5E5b7d",
            "businessPartner" : "BPNL50096894aXYZ"
        }
    ]
}

or

{
    "catenaXId": "urn:uuid:055c1128-0375-47c8-98de-7cf802c3241d",
    "parentItems": [
        {
            "catenaXId": "urn:uuid:7BeA9fAE-A1ca-D164-3BDF-0E5bac5E5b7d",
            "businessPartner" : "BPNL50096894aXYZ"
        }
    ]
}

This template describes the minimal necessary set of attributes for a valid data chain in Catena-X. A digital twin with a catenaXId and at least one linked “child” catenaXId or "parent" catenaXId is necessary to connect two individual digital twins, which can be provided by different companies. The use-cases have the possibility to extend this to their behalf and publish it as a separate Aspect Model.

The partentItems and the childItems contain objects with at least a catenaXId to identify the digital twin and a businessPartner to identify where to find the digital twin.

1.5 TERMINOLOGY​

This section is non-normative

Aspect Meta Model (SAMM): A Meta description model to describe AAS

Business Partner Number (BPN): A BPN is the unique identifier of a partner within Catena-x.

Additional terminology used in this standard can be looked up in the glossary on the association homepage.

2 DATA CHAIN ASPECT TEMPLATE​

This section is normative

The purpose of this data model is to enable newly defined data chain relevant aspect models to operate with the Item Relationship Service API, which is described in a separate reference implementation.

Classical naming convention:

  • the object MUST be a digital twin / AAS (Asset Administration Shell)
  • the object MUST be identified by catenaXId
  • the array of “child” objects MUST be identified by childItems
  • the array of “child” objects MUST contain at least one element
  • the item of a child item array element MUST be identified by catenaXId and a businessPartner (BPN)
  • the array of "parent" objects MUST be identified by parentItems
  • the array of "parent" objects MUST contain at least one element
  • the item of a parent item array element MUST be identified by catenaXId and a businessPartner (BPN)
  • the parameter businessPartner MUST be a BPNL

This template MAY be extended with use-case specific attributes. The template MUST be published as a new aspect model.

Changes in the minimal aspect model regarding the relationship of a data chain RECOMMENDED to be always backward compatible, so that existing data chains do not break.

2.1 FORMATS OF TEMPLATE​

2.1.1 JSON Schema​

2.1.1.1 JSON schema for relationship types of children​
{
    "$schema": "https://json-schema.org/draft-04/schema",
    "type": "object",
    "components": {
        "schemas": {
            "urn_samm_io.catenax.relationship_template_0.0.0_CatenaXIdTraitCharacteristic": {
                "type": "string",
                "pattern": "(^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}$)|(^urn:uuid:[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}$)"
            },
          "urn_samm_io.catenax.relationship_template_0.0.0_BpnTrait": {
            "type" : "string",
            "pattern" : "^(BPNL)([0-9]{8})([a-zA-Z0-9]{4})$"
          },
            "urn_samm_io.catenax.relationship_template_0.0.0_ChildData": {
                "type": "object",
                "properties": {
                    "catenaXId": {
                        "$ref": "#/components/schemas/urn_samm_io.catenax.relationship_template_0.0.0_CatenaXIdTraitCharacteristic"
                    },
                    "businessPartner": {
                        "$ref": "#/components/schemas/urn_samm_io.catenax.relationship_template_0.0.0_BpnTrait"
                    }
                },
                "required": [
                    "catenaXId",
                    "businessPartner"
                ]
            },
            "urn_samm_io.catenax.relationship_template_0.0.0_SetOfChildPartsCharacteristic": {
                "type": "array",
                "items": {
                    "$ref": "#/components/schemas/urn_samm_io.catenax.relationship_template_0.0.0_ChildData"
                },
                "uniqueItems": true
            }
        }
    },
    "properties": {
        "catenaXId": {
            "$ref": "#/components/schemas/urn_samm_io.catenax.relationship_template_0.0.0_CatenaXIdTraitCharacteristic"
        },
        "childItems": {
            "$ref": "#/components/schemas/urn_samm_io.catenax.relationship_template_0.0.0_SetOfChildPartsCharacteristic"
        }
    },
    "required": [
        "catenaXId",
        "childItems"
    ]
}
2.1.1.2 JSON Schema for Relationship types of parent​
{
    "$schema": "https://json-schema.org/draft-04/schema",
    "type": "object",
    "components": {
        "schemas": {
            "urn_samm_io.catenax.relationship_template_0.0.0_CatenaXIdTraitCharacteristic": {
                "type": "string",
                "pattern": "(^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}$)|(^urn:uuid:[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}$)"
            },
            "urn_samm_io.catenax.relationship_template_0.0.0_BpnTrait": {
                "type" : "string",
                "pattern" : "^(BPNL)([0-9]{8})([a-zA-Z0-9]{4})$"
            },
            "urn_samm_io.catenax.relationship_template_0.0.0_ParentData": {
                "type": "object",
                "properties": {
                    "catenaXId": {
                        "$ref": "#/components/schemas/urn_samm_io.catenax.relationship_template_0.0.0_CatenaXIdTraitCharacteristic"
                    },
                    "businessPartner": {
                        "$ref": "#/components/schemas/urn_samm_io.catenax.relationship_template_0.0.0_BpnTrait"
                    }

                },
                "required": [
                    "catenaXId",
                    "businessPartner"
                ]
            },
            "urn_samm_io.catenax.relationship_template_0.0.0_SetOfParentPartsCharacteristic": {
                "type": "array",
                "items": {
                    "$ref": "#/components/schemas/urn_samm_io.catenax.relationship_template_0.0.0_ParentData"
                },
                "uniqueItems": true
            }
        }
    },
    "properties": {
        "catenaXId": {
            "$ref": "#/components/schemas/urn_samm_io.catenax.relationship_template_0.0.0_CatenaXIdTraitCharacteristic"
        },
        "parentItems": {
            "$ref": "#/components/schemas/urn_samm_io.catenax.relationship_template_0.0.0_SetOfParentPartsCharacteristic"
        }
    },
    "required": [
        "catenaXId",
        "parentItems"
    ]
}

3 REFERENCES​

3.1 NORMATIVE REFERENCES​

  • “Digital Twins in Catena-X v2.2.0” [CX-0002]
  • “SAMM Aspect Meta Model v1.1.0” [CX-0003]
  • “Business Partner Number v2.0.0” [CX-0010]

3.2 NON-NORMATIVE REFERENCES​

This section is non-normative

  • “EDC Discovery API v1.0.2” [CX-0001]

Aspect models built upon this template:

  • “IndustryCorePartType v2.0.0" [CX-0126]
  • "IndustryCorePartInstance v2.0.0" [CX-0127]

3.3 REFERENCE IMPLEMENTATIONS​

This section is non-normative

not applicable

ANNEXES​

FIGURES​

This section is non-normative

not applicable

TABLES​

This section is non-normative

not applicable

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