bool overlap_equivalent (boost::shared_ptr<const Region>) const;
bool region_list_equivalent (boost::shared_ptr<const Region>) const;
bool source_equivalent (boost::shared_ptr<const Region>) const;
+ bool any_source_equivalent (boost::shared_ptr<const Region>) const;
bool uses_source (boost::shared_ptr<const Source>) const;
std::string source_string () const;