> For the complete documentation index, see [llms.txt](https://docs.os.uk/os-downloads/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.os.uk/os-downloads/products/transport-network-portfolio/os-mastermap-highways-network-fundamentals/os-mastermap-highways-network-getting-started-guide/file-naming.md).

# File naming

## GML file names <a href="#bookmark16" id="bookmark16"></a>

The file naming for the OS MasterMap Highways Network GML will be constructed as:

*Highways\_ProductName\_FeatureType\_SupplyType\_NullorDelete\_volumenumber.gml.gz*.

The name is composed of the following elements:

* ***Highways***: Identifies that the GML is from the OS MasterMap Highways Network product family.
* ***ProductName***: Is the name of the product that is being supplied, for example, Roads.
* ***FeatureType***: Is the name of the feature type that is being supplied in the GML file, for example, RoadLink.
* ***SupplyType***: Is the type of supply the GML is, for example, Full Supply or COU.
* ***NullorDelete***: This will not be present in any GML file names if the GML forms part of a Full Supply. If the GML forms part of a COU supply, then 'Delete' will identify if the file contains all the features which need removing from the customer holding as a part of the COU application.
* ***Volumenumber***: Will be the volume number for the file which will be three digits and the first volume will be 001.

## **Examples of the GML file names:**

* Highways\_Roads\_RoadLink\_Full\_001.gml.gz
* Highways\_Rrami\_AccessRestriction\_Full\_001.gml.gz
* Highways\_Paths\_Maintenance\_Full\_001.gml.gz

## GeoPackage file names <a href="#bookmark17" id="bookmark17"></a>

The file naming for the OS MasterMap Highways Network GeoPackage will be constructed as:

*OSMasterMapHighwaysNetworkProductName\_gb.gpkg*.

**Examples of GeoPackage file names:**

* OSMasterMapHighwaysNetworkRoad\_gb.gpkg
* OSMasterMapHighwaysNetworkPath\_gb.gpkg
* OSMasterMapHighwaysNetworkRAMI\_gb.gpkg

## Vector tiles file names <a href="#bookmark18" id="bookmark18"></a>

The file naming for the OS MasterMap Highways Network vector tiles will be constructed as:

*OSMasterMapHighwaysNetworkProductName\_gb.mbtiles*

**Examples of the vector tiles file names:**

* OSMasterMapHighwaysNetworkRoad\_gb.mbtiles
* OSMasterMapHighwaysNetworkPath\_gb.mbtiles


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