NCL object routines

attsetvalues	Applies resources to the given objects.
create_graphic	Creates a graphic object
destroy	Destroys objects from NCL.
get_isolines	Retrieves the points that define a contour line.
list_hlus	Lists all of the HLU objects currently referenced by NCL variables.
NhlAddAnnotation	Add annotations to a plot object as an external annotation.
NhlAddData	Adds one or more additional data items to a plot.
NhlAddOverlay	Overlays one plot object on another.
NhlAddPrimitive	Adds a Primitive object to an existing plot.
NhlAppGetDefaultParentId	Returns a reference to the current default App object.
NhlClassName	Retrieve the class name of one or more NCL objects.
NhlDestroy	Destroys objects from NCL.
NhlGetBB	Retrieves the bounding boxes of a list of NCL objects.
NhlGetClassResources	Returns a list of resources associated with the given class name and an optional filter string.
NhlGetErrorObjectId	Returns a reference to the current Error object.
NhlGetParentId	Returns the ids of the parent ids of the given objects.
NhlGetWorkspaceObjectId	Returns a reference to the current Workspace object.
NhlIsApp	Returns True for each given object that is an App object.
NhlIsDataComm	Returns True for each given object that is a DataComm object.
NhlIsDataItem	Returns True for each given object that is a DataItem object.
NhlIsDataSpec	Returns True for each given object that is a DataSpec object.
NhlIsTransform	Returns True for each given object that is a Transform object.
NhlIsView	Returns True for each given object that is a View object.
NhlName	Retrieves the name of one or more NCL objects.
NhlRemoveAnnotation	Remove annotations from the plot they are registered in.
NhlRemoveData	Removes data items from one or more plots.
NhlRemoveOverlay	Removes one or more plots from an overlay.
NhlRemovePrimitive	Removes one or more primitives from the given Transform object.
NhlUpdateData	Forces the DataComm instances to update their internal states.
overlay	Overlays one plot object on another.