# AppStream Compose API Reference

AscCompose — Compose catalog metadata easily.
AscHint — A data processing hint.
AscResult — A composer result for a single unit.
AscUnit — A data source unit (package, bundle, database, ...) for AscCompose to process
AscDirectoryUnit — A data source unit representing a simple directory tree
AscIconPolicy — Set policy on how to deal with different icon types.
asc-utils — Common utility functions for AppStream-Compose.
asc-globals — Set and read a bunch of global settings used across appstream-compose
asc-canvas — Draw text and render SVG graphics.
asc-image — Basic image rendering functions.

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