> For the complete documentation index, see [llms.txt](https://gitbook.semantify.it/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://gitbook.semantify.it/domainspecifications.md). # Domain Specifications A Domain Specification (DS) is a formalized, machine-readable, and structured document that defines syntactic and semantic, domain-specific constraints for Schema.org annotations. The main purpose of Domain Specifications is to define a standard to which schema.org annotations have to comply, this is checked during a process called "domain-specific verification". Domain Specifications can also be used as a dynamic guideline for the creation, mapping and presentation of structured data. Since the concept of Domain Specifications has been enhanced multiple times, documentation for the different versions is provided: * [DS-V7](/domainspecifications/ds-v7.md) - Stable (latest in use) * [DS-V6](/domainspecifications/ds-v6.md) - Unused * [DS-V5](/domainspecifications/ds-v5.md) - Deprecated * [DS-V4](/domainspecifications/ds-v4.md) - Deprecated * [DS-V3](/domainspecifications/ds-v3.md) - Deprecated * [DS-V2](/domainspecifications/ds-v2.md) - Deprecated * [DS-V1](/domainspecifications/ds-v1.md) - Deprecated Note that the term "Verification" was introduced as our standard to define the process of checking the compliance of given data based on a given domain specification. Before that, we used the term "Validation", which could still appear on some parts of this documentation. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://gitbook.semantify.it/domainspecifications.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.