# Line

Features representing topographic objects and concepts that have a line-based geometry.

<figure><img src="https://1897589978-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FcNpJpLP8RROUaWVQo5ea%2Fuploads%2FQjdY23CbzWquh0uisDJN%2Fimage.png?alt=media&#x26;token=2b4b371f-2c53-496c-a462-8fce28f23e95" alt="UML diagram of the Line Feature Type, listing its four attributes. The feature type and its attributes are described in detail in the FeatureType Line table." width="314"><figcaption><p>UML diagram showing the Line Feature Type in the GML supply.</p></figcaption></figure>

## Line attributes

### polyline

An ordered set of points forming a line feature.

* **Type:** GM\_Curve
* **Length:** N/A
* **Multiplicity:** \[1]

### featureID

A unique feature identification. IDs will be retained between iterations but will not be version controlled.

* **Type:** CharacterString
* **Length:** 38
* **Multiplicity:** \[1]

### featureCode

A unique feature code to facilitate analysis and styling.

* **Type:** [FeatureCodeValue](https://docs.os.uk/os-downloads/products/maps-and-imagery-portfolio/os-vectormap-local/os-vectormap-local-technical-specification/feature-codes-and-descriptions)
* **Length:** 5
* **Multiplicity:** \[1]

### featureDescription

A description of the feature code.

* **Type:** [FeatureDescriptionValue](https://docs.os.uk/os-downloads/products/maps-and-imagery-portfolio/os-vectormap-local/os-vectormap-local-technical-specification/feature-codes-and-descriptions)
* **Length:** 60
* **Multiplicity:** \[1]