gio:settings-schema-source-lookup (source id recursive)

source -- a g:settings-schema-source instance
id -- a string for the schema ID
recursive -- a boolean whether the lookup should be recursive

Looks up a schema with the identifier id in source. If the schema is not found directly in source and recursive is true then the parent sources will also be checked. If the schema is not found, nil is returned.

This function is not required for normal uses of GSettings but it may be useful to authors of plugin management systems or to those who want to introspect the content of schemas.