CEL Filters
skyway supports the Common Expression Language (CEL) for filtering elements. Each time the filter is evaluated for a given element, that expression's context (local variables) is updated to match the element's metadata. For now, CEL filters may only return a boolean value, indicating whether or not the element should be kept. Please file an issue if you'd like to see more complex CEL return types supported.
CEL Context
The following table describes each variable available to your expression:
| Variable Name | CEL Type |
|---|---|
tags | map with string keys and string values |
changeset | int |
user | string |
uid | int |
id | int |
timestamp | string |
visible | bool |
type | string ("node", "way", or "relation") |