Import common elements and data types A collection of webpages and other resources provided over the Internet. Restrictions and leagal reprequisites for accessing the tool. These includes any access oncstraints applied to assure the protection of privacy or intellectual property. Corresponds to section 1.7 accconst of the CSDGM. Restrictions and legal prerequisites for using the data set after access is granted. Corresponds to section 1.8 useconst of the CSDGM.