def add_resources(self, fragments):
for fragment in fragments:<EOL><INDENT>self.add_fragment_resources(fragment)<EOL><DEDENT>
Add all the resources from `fragments` to my resources.

This is used to aggregate resources from a sequence of fragments that
should be considered part of the current fragment.

The content from the Fragments is ignored.  The caller must collect
together the content into this Fragment's content.