# SKOS The [Simple Knowledge Organization System](https://en.wikipedia.org/wiki/Simple_Knowledge_Organization_System) is used to structure a number of OpenActive [Controlled Vocabularies](https://en.wikipedia.org/wiki/Controlled_vocabulary), and is supported by repos with the topic `skos`. For a list of OpenActive SKOS vocabularies, see the [Controlled Vocabularies page](/guide-to-openactive-on-github/controlled-vocabularies.md). * [**iqvoc**](https://github.com/openactive/iqvoc): A SKOS editor, customised for OpenActive use. * [**skos.js**](https://github.com/openactive/skos.js)**:** JavaScript library wrapping OpenActive JSON-LD with functions. * [**activity-list-xml-json**](https://github.com/openactive/activity-list-xml-json)**:** Takes XML-encoded activity input and converts it into a JSON-LD representation. * [**concept-scheme-restriction-generator**](https://github.com/openactive/concept-scheme-restriction-generator)**:** Outputs complete Concept Scheme files from ConceptSchemeRestrictions. In other words, given a parent Concept Scheme and a list of attributes to exclude from it, generates a Concept Scheme consisting of only those attributes which remain. --- # 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://developer.openactive.io/guide-to-openactive-on-github/skos.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.