These are indeed criminal proceedings, but the criminals are those who are putting Wilders on trial. From the excellent Wilders On Trial site:
Criminal proceedings to resume in October 2010
The criminal proceedings against Geert Wilders will continue in October of this year. The dates of absence of the people involved in the proceedings prevent the case coming up for trial sooner. The last expert-witnesses will be heard on the 28th of June.
The provisional planning of the proceedings will be as follows:
October 4th, 6th and 8th: trial proceedings
October 12th: indictment
October 15th: defence
October 19th: replication and rejoinder
November 2nd: verdict