> 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/water-portfolio/os-open-rivers/os-open-rivers-technical-specification/geopackage-overview/geopackage-format-changes-april-2023.md).

# GeoPackage format changes April 2023

In April 2023 there were significant changes to the naming patterns in the GeoPackage format. The formatting of most names changed from title case to snake case. The following tables map the previous names to those use after April 2023.

## Attribute names

<table><thead><tr><th width="400">GeoPackage attribute name prior to April 2023</th><th>GeoPackage attribute name after April 2023</th></tr></thead><tbody><tr><td>id</td><td>id</td></tr><tr><td>flowDirection</td><td>flow_direction</td></tr><tr><td>length</td><td>length</td></tr><tr><td>fictitious</td><td>fictitious</td></tr><tr><td>form</td><td>form</td></tr><tr><td>watercourseName</td><td>watercourse_name</td></tr><tr><td>watercourseNameAlternative</td><td>watercourse_name_alternative</td></tr><tr><td>startNode</td><td>start_node</td></tr><tr><td>endNode</td><td>end_node</td></tr><tr><td>hydroNodeCategory</td><td>hydro_node_category</td></tr></tbody></table>

## Layer names

<table><thead><tr><th width="399">GeoPackage layer name prior to April 2023</th><th>GeoPackage layer name after April 2023</th></tr></thead><tbody><tr><td>HydroNode</td><td>hydro_node</td></tr><tr><td>WatercourseLink</td><td>watercourse_link</td></tr></tbody></table>

## Column names

<table><thead><tr><th width="401">GeoPackage column name prior to April 2023</th><th>GeoPackage column name after April 2023</th></tr></thead><tbody><tr><td>geom</td><td>geometry</td></tr></tbody></table>

## Constraints

<table><thead><tr><th width="405">GeoPackage constraint name prior to April 2023</th><th>GeoPackage constraint name after April 2023</th></tr></thead><tbody><tr><td>HydroNode_pkey</td><td>hydro_node_pkey</td></tr><tr><td>WatercourseLink_pkey</td><td>watercourse_link_pkey</td></tr></tbody></table>


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