async def get_schemes(self) -> List[Scheme]:
        """Return supported uri schemes."""
        return [
            Scheme.make(**x)
            for x in await self.services["avContent"]["getSchemeList"]()
        ]
async def get_schemes ( self ) -> List [ Scheme ] : return [ Scheme . make ( ** x ) for x in await self . services [ "avContent" ] [ "getSchemeList" ] ( ) ]
Return supported uri schemes.