| 2020-12 | urn | RFC 8141 Uniform Resource Name (URN) | A non-locatable Uniform Resource Identifier (URI) that uses the urn scheme | |
| 2020-12 | url | RFC 3986 Uniform Resource Locator (URL) | A locatable absolute Uniform Resource Identifier (URI) | |
| 2020-12 | uri-relative | RFC 3986 Uniform Resource Identifier (URI) relative reference | A relative Uniform Resource Identifier (URI) reference to be resolved with a base URI | |
| 2020-12 | uri-reference | RFC 3986 Uniform Resource Identifier (URI) reference | A Uniform Resource Identifier (URI) reference | |
| 2020-12 | uri | RFC 3986 Uniform Resource Identifier (URI) | A unique sequence of characters that identifies an abstract or physical resource | |
| 2020-12 | path-posix-relative | IEEE Std 1003.1-2017 POSIX File Path (Relative) | IEEE Std 1003.1-2017 POSIX relative pathname | |
| 2020-12 | path-posix-absolute | IEEE Std 1003.1-2017 POSIX File Path (Absolute) | IEEE Std 1003.1-2017 POSIX absolute pathname | |
| 2020-12 | path-posix | IEEE Std 1003.1-2017 POSIX File Path) | IEEE Std 1003.1-2017 POSIX pathname | |
| 2020-12 | page | Sourcemeta Registry Page | Represents directory of other pages or schema collections | |
| 2020-12 | extends | Sourcemeta Registry Extends | A utility mechanism for inhering from other configuration files | |
| 2020-12 | email-address | RFC 5322 Email Address (Addr-Spec) | A specific Internet identifier that represents an e-mail box to which messages are delivered | |
| 2020-12 | contents | The Sourcemeta Registry Contents | An internal utility to represent the tree-structure of the configuration format | |
| 2020-12 | configuration | The Sourcemeta Registry configuration file format | The configuration file format used to configured Registry instances | |
| 2020-12 | collection | Sourcemeta Registry Collection | Represents a set of schemas to be mounted into the Registry | |