| ENTITY patch SUBTYPE OF (mesh); END_ENTITY; -- patch | 
| Entity data types and their attributesrepresentation_itemname: label; topological_representation_item - mesh description: text; index_count: INTEGER; patch - | 
| explicitly_defined_cell_patch (MESH_TOPOLOGY_SCHEMA) | 
| explicitly_defined_vertex_patch (MESH_TOPOLOGY_SCHEMA) | 
| vertex_range_defined_patch (MESH_TOPOLOGY_SCHEMA) | 
| sc1_patch (MESH_TOPOLOGY_SCHEMA) | 
| Global rules for this entity data type- | 
| public interface EPatch extends EMesh | 
| public class CPatch implements EPatch | 
| public class APatch extends AEntitypublic EPatch getByIndex(int index)public EPatch getCurrentMember(SdaiIterator it) |