---
type: "datatype"
title: "id"
datatype: "id"
---
# id

- [Datatypes](/datatypes)
- [Definitions](/datatypes-definitions#id)
- [Examples](/datatypes-examples#id)
- [Mappings](/datatypes-mappings#id)
- [Profiles](/datatypes-profiles#id)

## Primitive Details
- **Definition**: Any combination of letters, numerals, "-" and ".", with a length limit of 64 characters. (This might be an integer, an unprefixed OID, UUID or any other identifier pattern that meets these constraints.) Ids are case-insensitive.
- **Comments**: RFC 4122
- **XML Schema/Base**: `xs:string+`
- **JSON Type**: `string`
- **Regex**: `[A-Za-z0-9\-\.]{1,64}`