mapnik-reference is a parse-able spec of what Mapnik can do - what main structures
it supports (like layers, styles, and symbolizers) and the properties they can contain.
It's useful for building parsers, tests, compilers, and syntax highlighting/checking for languages.
The version of this repository indicates the schema of the reference.json file. Schema changes of any type are expected to change the implementation requirements of a parser, so they will increment the major version of this repository in semver style.
The directories in this repository directly correspond to released versions of Mapnik
and the next targeted release of Mapnik. The latest reference, usually targeted
toward a pre-release, is copied into
/latest for convenience.
The structure of the file is as such:
version: the version of Mapnik targeted. Same as the containing directory.
style: properties of the
layer: properties of the
symbolizers/*: properties that apply to all symbolizers
symbolizers/symbolizer: properties that apply to each type of symbolizer
colors: named colors supported by Mapnik. see
npm install mapnik-reference
Once installing it as a dependency (like it's used in Carto), it can be included and used for a specific version of Mapnik:
var mapnik_reference = require('mapnik-reference'); var data = mapnik_reference.version['2.1.0'];
Other implementations will want to simply copy the JSON file
from the desired implementation, like
2.0.1/reference.json. For python we could consider
uploading to pypi if there is interest.
The file can then be parsed with any of the many json parsers.
Tests require python: