A/HRC/19/64 3. Personal data processing at national, regional and local levels should comply with internationally accepted standards and ethical safeguards.fff 4. Internationally agreed uniform standards should be established to facilitate international comparability of data. 8. International co-operation 1. Member states of the Council of Europe should co-operate with each other, in accordance with these guidelines and through application of relevant international and regional instruments and arrangements agreed on the basis of uniform or reciprocal legislation and internal laws, to the widest extent possible, for the purpose of: a. preventing and combating all forms of violence against children; b. protecting and assisting child victims and witnesses; c. children. investigating or prosecuting criminal offences involving violence against 2. Member states should afford each other the widest measure of mutual assistance in proceedings on offences involving violence against children, such as child abductions, trafficking in children, sexual exploitation and sexual abuse of children. 3. To facilitate implementation of the guidelines, member states should strengthen, as appropriate, co-operation within relevant intergovernmental bodies, transnational networks and other international organisations. 4. Each member state should endeavour to integrate, where appropriate, prevention and eradication of all forms of violence against children into development assistance programmes provided for the benefit of third countries. fff Refer to the Convention for the Protection of Individuals with regard to Automatic Processing of Personal Data (ETS No. 108) and the Additional Protocol to the Convention for the Protection of Individuals with regard to Automatic Processing of Personal Data, regarding Supervisory Authorities and Transborder Data Flows (ETS No. 181). 91