He wasn't charged with anything.
http://en.wikipedia.org/wiki/Assange_v_Swedish_Prosecution_A...
"Assange has not yet been formally charged with any offence.[62] The prosecutor said that, in accordance with the Swedish legal system, formal charges will be laid only after extradition and a second round of questioning. Observers note however that Assange has not yet been interviewed about several of the allegations,[63] including the most serious, and that Swedish law allows interviews to be conducted abroad under Mutual Legal Assistance provisions.[64]"