Here is a list of all documented namespaces with brief descriptions:

[detail level 123]

▼NHermes
▼NHermes2D	Namespace containing definitions specific for Hermes2D
NPostProcessing	Solution (mesh function) Postprocessing capabilities
NRefinementSelectors	Namespace which encapsulates all refinement selectors
NViews	Namespace containing Views classes, Linearizer classes, and support for these
▼Nxml_schema	C++ namespace for the http://www.w3.org/2001/XMLSchema schema namespace
Ndom	DOM interaction
NXMLMesh	C++ namespace for the XMLMesh schema namespace
NXMLMesh1D	C++ namespace for the XMLMesh1D schema namespace
NXMLSolution	C++ namespace for the XMLSolution schema namespace
NXMLSpace	C++ namespace for the XMLSpace schema namespace
NXMLSubdomains	C++ namespace for the XMLSubdomains schema namespace