exceptions
Class: PenmanError
Base class for errors in the Penman package
Class: ConstantError
Raised when working with invalid constant values
Class: GraphError
Raised on invalid graph structures or operations
Class: LayoutError
Raised on invalid graph layouts
Class: ModelError
Raised when a graph violates model constraints.
Class: SurfaceError
Raised on invalid surface information
Class: DecodeError
Raised on PENMAN syntax errors