> For the complete documentation index, see [llms.txt](https://open-dataspaces.gitbook.io/ods-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://open-dataspaces.gitbook.io/ods-docs/odp/overview.md).
# Introduction
## Purpose and Background
This protocol specification document (Open Dataspaces Protocol: ODP) aims to provide an abstract specification of interoperable communication procedures (Protocol) that references the Open Data Spaces Reference Architecture Model (ODS-RAM) and aligns with its design principles. It translates the functions of each layer and perspective described in ODS-RAM into an abstract protocol specification, providing implementers with technical development guidelines grounded in its design philosophy. Furthermore, it seeks to deliver an abstract specification with extensibility and generality that, while presenting reference implementation examples, offers implementers flexibility in their choice of technology stack.
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## Status of the Protocol Specification
This protocol specification is established as the official normative protocol specification within the ODS ecosystem and will be continuously updated in accordance with revisions to the ODS-RAM and related documents.
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## Scope
This specification covers the following domains and corresponds to each layer and perspective defined in the ODS-RAM.
| ODS-RAM | Protocol Name | Protocol Category |
| ---------------------- | ------------------------------------------- | ----------------- |
| Common Functionalities | Logging | Fundamental |
| Common Functionalities | Monitoring | Fundamental |
| Common Functionalities | Notifier | Fundamental |
| L1 | Data Trust Assessment | Fundamental |
| L1 | Data Trustworthiness and Quality Assessment | Fundamental |
| L2 | Transaction | Fundamental |
| L3 | Identity and Trust | Fundamental |
| L4 | Metadata Exchange | Fundamental |
| L4 | Discovery and Search | Fundamental |
| P1 | Heuristic Contracting | Complementary |
| P1 | Clearing and Payment | Complementary |
Figure 1 Relationship Between Layers and Perspectives in ODS-RAM
***
## Intended Audience
The primary readers of this specification include:
* System architects and engineers who design and operate Open Dataspaces
* Developers implementing transaction connector, identity infrastructures, and semantic infrastructures
* Data management departments engaged in cross-industry data collaboration
* Research institutions, standardization bodies, and participants in pilot projects
* Technical leaders of companies and municipalities participating in the ODS ecosystem
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