Format fixed in URN namespace page

# OSM URN Namespace

### Introduction

## Introduction

OSM is maintaining a namespace registry as a sub tree of the ETSI root `urn:etsi` namespace. A description of the top level ETSI URN namespace can be found on the [ETSI PNNS page](https://portal.etsi.org/PNNS/GenericAllocation/ETSIURNNamespace.aspx)

The OSM URN namespace has the following structure:

```

```text

urn:etsi:osm:<OSM sub-tree>

```

The following sections describe the basic structure of the sub-tree and how a entry in the registry can be requested.

### OSM sub-tree

## OSM sub-tree

| OSM sub-tree |    Full Namespace    |  Type  |                         Description                          |

| :----------: | :------------------: | :----: | :----------------------------------------------------------: |

|     yang     | `urn:etsi:osm:yang ` | string | Namespace for YANG modules specified in OSM.[OSM/IM.git](https://osm.etsi.org/gitweb/?p=osm/IM.git;a=tree;f=models/yang) |

#### Type definitions

### Type definitions

```

```python

string = (ALPHA)0*(ALPHANUMERIC/-/_)

# a string starts with an upper- or lower-case letter followed by zero or more upper- or lower-case letters, integer numbers, hyphens or underscores

ALPHANUMERIC = {a-zA-Z0-9}

```

### Requesting a entry

## Requesting a entry

The procedure to request an entry is described as follows.

- *Step #1:* Send an e-mail to the [OSM_TSC@list.etsi.org](https://mail.google.com/mail/?view=cm&fs=1&tf=1&to=OSM_TSC@list.etsi.org) mailing list indicating the name of the sub-tree, the contact person and the purpose of that subtree.

- Step #2:

  The TSC will review the proposal.

- **Step #1:** Send an e-mail to the <OSM_TSC@list.etsi.org> mailing list indicating the name of the sub-tree, the contact person and the purpose of that subtree.

- **Step #2:** The TSC will review the proposal.

  - If the application is accepted, a new entry in the "OSM URN Namespace" will be enabled.

  - If the application cannot be accepted, it will be communicated to the contact person together with any additional information to be considered for resolving the "non-acceptance".