<http://schema.org/dateModified>
"2013-12-11T21:08:46Z"^^<http://schema.org/Date>
<http://chemwiki.ucdavis.edu/Inorganic_Chemistry/Electronic_Structure_of_Atoms_and_Molecules/Electronic_Configurations/Case_Study%3A_Electron_Configuration_of_Mn_vs._Cu>