Standards bodies
The XML Schema schema
The schema for schemas: XSD's own grammar, written in XSD, at the URI every schema document declares as its namespace.
This is the document the XML Schema namespace URI actually resolves to, which makes it the best possible answer to the question of whether a namespace URI is an address. It is not — nothing fetches it — but here it happens to be one anyway.
It is also a genuinely useful reference: every element and type the schema language offers is declared in it, in the language it defines.
It is the one entry here our own extractor cannot read. The document declares parameter entities in its internal subset, and the parser behind our structure extraction refuses them outright — so the check below records that it is well-formed and says plainly that it has no structure to show, rather than inventing one.
- Publisher
- W3C
- Host
www.w3.org- Format
- XML Schema (XSD)
- Root when listed
- xs:schema (2026-08-18)
- Size when listed
- 85.6 KB
What the last check saw
The document is well-formed, but its structure could not be extracted: Invalid entity name %Checked 2026-08-18 16:02 UTCStructure
No structure to show — and rather than a table of dashes, this says so. Structure is recorded from a successful fetch and never copied from the entry above: a directory that describes documents it has not read is a directory that is wrong without knowing it.
Recent checks
- ok2026-08-18 16:02 UTC
- ok2026-08-18 16:01 UTC
Where it reaches
- NamespacesXML Schema Definition (XSD)The namespace this document defines, and which every schema declares.
- FormatsXML Schema (XSD)The format page for schema documents in general.
Also in this category
- The sitemaps.org 0.9 schemaThe normative grammar for a sitemap — the one that says changefreq has eight permitted values and priority is capped at 1.0.
- The RFC indexEvery RFC ever published, with authors, dates, status and the obsoletes/updates graph between them — as one XML document.
- IANA media type registryThe authoritative list of registered media types, including the application/xml and +xml conventions this whole site depends on.
- CLDR locale data for EnglishHow English formats dates, numbers, currencies and names — the locale data almost every operating system and language runtime is built on.
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