what is needed to update a RDF composite when changing source files on the Web

I added some code around RDF composites to make them update in a more 
predictable way from user's point of view and also update Web data sources.

Now I have one composite that loads local or Web files. If I upload some 
new contents to a Web URI that is already also loaded to a composite, 
what is the best way to update the composite?

Is it enough to just do a refresh to the remote data source based on the 
Web URI? It seems that the composite just keeps track of the component 
data sources and does not need to change?

Marja