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+---
+rfc: 0015
+start_date: 2018-02-09
+pr: openregister/registers-rfcs#28
+status: rejected
+---
+
+# Schema resource
+
+This RFC has been rejected (see comments
+https://github.com/openregister/registers-rfcs/pull/28).
+
+In summary, this resource doesn't fit well with the broader metadata stream of
+work. Schema will be addressed in a future RFC.
+
+## Summary
+
+This RFC proposes a schema resource to describe the register set of attributes
+with their datatypes.
+
+
+## Motivation
+
+The current mechanisms to get information about the schema are the `GET
+/register` endpoint or the Register register complemented with the Field
+register. It is cumbersome to get the full picture of the schema and, even
+more the day the schema gets the ability to evolve.
+
+
+## Explanation
+
+Note: All datatypes mentioned in this RFC are defined by the specification. In
+a few cases like `Cardinality` or `Datatype` it is described inline.
+
+***
+### Endpoint
+
+```
+GET /schema
+```
+
+### Parameters
+
+|Name|Type|Description|
+|-|-|-|
+|`log-size` | Optional `Integer`| Set the log size to the given entry number instead of the latest value.|
+
+
+### Response attributes
+
+|Name|Type|Description|
+|-|-|-|
+|`attributes` | List of `Attribute`| The list of attributes.|
+
+
+### Attribute attributes
+
+|Name|Type|Description|
+|-|-|-|
+|`label` | `Attrname` | The attribute machine-readable name. (`[a-z][a-z0-9-]*`)|
+|`title` | `String` | The attribute human-readable title.|
+|`description` | `Text` | The attribute description.|
+|`datatype` | `Datatype` | The attribute datatype. (one of `curie`, `datetime`, `attrname`, `hash`, `integer`, `period`, `string`, `text`, `url`)|
+|`cardinality` | `Cardinality` | The attribute cardinality (either `1` or `n`).|
+***
+
+Note that meanwhile there is no schema evolution, `log-size` doesn't affect
+the result.
+
+***
+**EXAMPLE:**
+
+```http
+GET /schema HTTP/1.1
+Host: approved-open-standard-guidance.register.gov.uk
+Accept: application/json
+```
+
+```http
+HTTP/1.1 200 OK
+Content-Type: application/json
+
+{
+  "attributes": [
+    {
+      "label": "name",
+      "title": "Name",
+      "description": "The commonly-used name of a record.",
+      "datatype": "string",
+      "cardinality": "1"
+    },
+    {
+      "label": "approved-open-standards",
+      "title": "Approved open standards",
+      "description": "Open standards that have been approved by government technology.",
+      "datatype": "curie",
+      "cardinality": "n"
+    },
+    {
+      "label": "website",
+      "title": "Website",
+      "description": "The website for a record.",
+      "datatype": "url",
+      "cardinality": "1"
+    },
+    {
+      "label": "start-date",
+      "title": "Start date",
+      "description": "The date a record first became relevant to a register.",
+      "datatype": "datetime",
+      "cardinality": "1"
+    },
+    {
+      "label": "end-date",
+      "title": "End date",
+      "description": "The date a record stopped being applicable.",
+      "datatype": "datetime",
+      "cardinality": "1"
+    },
+
+  ]
+}
+```
+***