[[edit source](/w/index.php?title=Semantic_Web&action=edit&section=6 "Edit section's source code: Tags and identifiers")] [Tags](https://en.wikipedia.org/wiki/Tag_(metadata) "Tag (metadata)"), including hierarchical categories and tags that are collaboratively added and maintained (e.g. with [folksonomies](https://en.wikipedia.org/wiki/Folksonomy "Folksonomy")) can be considered part of, of potential use to or a step towards the semantic Web vision.[[21]](#cite_note-21)[[22]](#cite_note-22)[[23]](#cite_note-23) Unique [identifiers](https://en.wikipedia.org/wiki/Identifier "Identifier"), including hierarchical categories and collaboratively added ones, analysis tools and [metadata](https://en.wikipedia.org/wiki/Metadata "Metadata"), including tags, can be used to create forms of semantic webs – webs that are to a certain degree semantic.[[24]](#cite_note-24) In particular, such has been used for structuring scientific research i.a. by research topics and [scientific fields](https://en.wikipedia.org/wiki/Branches_of_science "Branches of science") by the projects [OpenAlex](https://en.wikipedia.org/wiki/OpenAlex "OpenAlex"),[[25]](#cite_note-25)[[26]](#cite_note-26)[[27]](#cite_note-27)[Wikidata](https://en.wikipedia.org/wiki/Wikidata "Wikidata") and [Scholia](https://en.wikipedia.org/wiki/Scholia "Scholia") which are under development and provide [APIs](https://en.wikipedia.org/wiki/API "API"), Web-pages, feeds and graphs for various [semantic queries](https://en.wikipedia.org/wiki/Semantic_query "Semantic query").

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  "text": "[[edit source](/w/index.php?title=Semantic_Web&action=edit&section=6 \"Edit section's source code: Tags and identifiers\")]\n\n[Tags](https://en.wikipedia.org/wiki/Tag_(metadata) \"Tag (metadata)\"), including hierarchical categories and tags that are collaboratively added and maintained (e.g. with [folksonomies](https://en.wikipedia.org/wiki/Folksonomy \"Folksonomy\")) can be considered part of, of potential use to or a step towards the semantic Web vision.[[21]](#cite_note-21)[[22]](#cite_note-22)[[23]](#cite_note-23)\n\nUnique [identifiers](https://en.wikipedia.org/wiki/Identifier \"Identifier\"), including hierarchical categories and collaboratively added ones, analysis tools and [metadata](https://en.wikipedia.org/wiki/Metadata \"Metadata\"), including tags, can be used to create forms of semantic webs – webs that are to a certain degree semantic.[[24]](#cite_note-24) In particular, such has been used for structuring scientific research i.a. by research topics and [scientific fields](https://en.wikipedia.org/wiki/Branches_of_science \"Branches of science\") by the projects [OpenAlex](https://en.wikipedia.org/wiki/OpenAlex \"OpenAlex\"),[[25]](#cite_note-25)[[26]](#cite_note-26)[[27]](#cite_note-27)[Wikidata](https://en.wikipedia.org/wiki/Wikidata \"Wikidata\") and [Scholia](https://en.wikipedia.org/wiki/Scholia \"Scholia\") which are under development and provide [APIs](https://en.wikipedia.org/wiki/API \"API\"), Web-pages, feeds and graphs for various [semantic queries](https://en.wikipedia.org/wiki/Semantic_query \"Semantic query\").",
  "access_class": "public",
  "heading": "Tags and identifiers",
  "observed_at": "2026-07-18T21:40:59.214Z",
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}