/*! \page grouping_elements_page Grouping elements In Mesh module it is possible to create groups of mesh elements: nodes, edges, faces or volumes: <ul> <li> by selecting the elements of the specified kind by their IDs or directly on the presentation in the VTK viewer - <b>Standalone group</b> tab of \subpage creating_groups_page "Create group" dialog.</li> <li> by creating a group of elements of the selected type from all such elements of the chosen geometrical object - <b>Group on geometry</b> tab of \ref creating_groups_page "Create group" dialog.</li> <li> by creating a group including all types of elements from an existing geometrical object - using \subpage create_groups_from_geometry_page "Create Groups from Geometry" dialog.</li> <li> by creating several groups of elements (nodes, edges, faces and volumes) from the chosen submesh - using <b>Mesh -> Construct Group</b> Menu item. In this case groups of elements are created automatically.</li> <li> by creating groups of entities from existing groups of superior dimensions - using \subpage group_of_underlying_elements_page "Create Group of Underlying Elements" dialog.</li> </ul> The created groups can be later: <ul> <li>\subpage editing_groups_page "Edited"</li> <li>\subpage using_operations_on_groups_page "Subjected to Boolean operations"</li> <li>\subpage deleting_groups_page "Deleted"</li> </ul> An important tool, providing filters for creation of \b Standalone groups is \ref selection_filter_library_page. */