OptionalavailableThe IDs of the images that image treats as available.
OptionalcanonicalThe tile that holds the feature. within and distance need it to read
the feature's geometry.
OptionalcolorThe value of heatmap-density, line-progress, and elevation.
OptionalfeatureThe feature to evaluate against, as a GeoJSON feature, or empty for none.
OptionalfeatureThe feature's state, as a JSON object, or empty for none.
OptionalglobalThe values that global-state reads, as a JSON object, or empty for none.
Optionalzoom
The inputs that a style expression reads while it evaluates.
See
mln_style_expression_inputsin the C API reference.