An attributes is a kind of property that can be associated to a graph. An attributes has a name (a string) and a value of any type. It can be, for example ,the name of a graph, or a date of creation of the graph.
Attributes can be added and accessed with those three following member functions :
const DataSet getAttributes() : returns the attributes of a graph.
template<typename ATTRIBUTETYPE>bool getAttribute(const std::string &name, ATTRIBUTETYPE &value) : get an attribute.
template<typename ATTRIBUTETYPE>void setAttribute (const std::string &name, const ATTRIBUTETYPE &value) : set a new attribute value.