> 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-routing-and-asset-management-information/os-mastermap-highways-network-routing-and-asset-management-information-technical-specification/specification-changes.md).

# Specification changes

There have been small enhancements to the OS MasterMap Highways Network Version 2.2 to enable the release of new features and functionality. This page will outline the main changes to the RAMI product. For changes to the [Roads](https://www.ordnancesurvey.co.uk/business-government/tools-support/mastermap-highways-support) or [Paths](https://www.ordnancesurvey.co.uk/business-government/tools-support/mastermap-highways-support) products, please see their respective Technical Specifications.

## Features <a href="#id-2.1-features" id="id-2.1-features"></a>

* Added new feature type, HighwayDedication, to denote dedications of highways as defined in the [Highway Act 1980](https://www.legislation.gov.uk/ukpga/1980/66/contents) and [Countryside and Rights of Way Act 2000.](https://www.legislation.gov.uk/ukpga/2000/37/contents)
* Added new code list, DedicationValue, for HighwayDedication features.

## Code lists, data types, and enumerations <a href="#id-2.2-code-lists-data-types-and-enumerat" id="id-2.2-code-lists-data-types-and-enumerat"></a>

* **March 2021** – The ReinstatementTypeValue code list has been updated with four new values added to include Scottish codes.
* **March 2021** – The SpecialDesignationTypeValue code list has been updated with five new values added to include Scottish codes.
* The NetworkReferenceLocation has been further extended to accept additional geometry types, lines and polygons, in addition to start and end points. This affects *Maintenance*, *Reinstatement* and *Special Designation* and the information provided on their location for partial records.
* The SpecialDesignationTypeValue code list has been updated with multiple new values added.
* The MaintenanceValue enumeration has been updated with two values added.

## Schema changes <a href="#id-2.3-schema-changes" id="id-2.3-schema-changes"></a>

* v2.1 RAMI schema is being released which will enable the code list and enumerations described above to be delivered.
* v1.0 Highways Dedication schema has been introduced which defines the Highways Dedication feature.


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