# 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](https://gitbook.semantify.it/domainspecifications/ds-v7) - Stable (latest in use) * [DS-V6](https://gitbook.semantify.it/domainspecifications/ds-v6) - Unused * [DS-V5](https://gitbook.semantify.it/domainspecifications/ds-v5) - Deprecated * [DS-V4](https://gitbook.semantify.it/domainspecifications/ds-v4) - Deprecated * [DS-V3](https://gitbook.semantify.it/domainspecifications/ds-v3) - Deprecated * [DS-V2](https://gitbook.semantify.it/domainspecifications/ds-v2) - Deprecated * [DS-V1](https://gitbook.semantify.it/domainspecifications/ds-v1) - 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: 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: ``` GET https://gitbook.semantify.it/domainspecifications.md?ask= ``` The question should be specific, self-contained, and written in natural language. 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.