Update entity_relationship_generator.py

entity_relationship_generator.py

@@ -1,650 +1,3 @@
-# import graphviz
-# import json
-# from tempfile import NamedTemporaryFile
-# import os
-
-# def generate_entity_relationship_diagram(json_input: str, output_format: str) -> str:
-#     """
-#     Generates an Entity Relationship (ER) diagram from JSON input.
-
-#     Args:
-#         json_input (str): A JSON string describing the ER diagram structure.
-#                           It must follow the Expected JSON Format Example below.
-
-#     Expected JSON Format Example:
-#     {
-#       "entities": [
-#         {
-#           "name": "User",
-#           "type": "strong",
-#           "attributes": [
-#             {
-#               "name": "user_id",
-#               "type": "primary_key"
-#             },
-#             {
-#               "name": "username",
-#               "type": "regular"
-#             },
-#             {
-#               "name": "email",
-#               "type": "regular"
-#             },
-#             {
-#               "name": "password_hash",
-#               "type": "regular"
-#             },
-#             {
-#               "name": "full_name",
-#               "type": "composite"
-#             },
-#             {
-#               "name": "phone_numbers",
-#               "type": "multivalued"
-#             },
-#             {
-#               "name": "age",
-#               "type": "derived"
-#             }
-#           ]
-#         },
-#         {
-#           "name": "Product",
-#           "type": "strong",
-#           "attributes": [
-#             {
-#               "name": "product_id",
-#               "type": "primary_key"
-#             },
-#             {
-#               "name": "name",
-#               "type": "regular"
-#             },
-#             {
-#               "name": "description",
-#               "type": "regular"
-#             },
-#             {
-#               "name": "price",
-#               "type": "regular"
-#             },
-#             {
-#               "name": "stock_quantity",
-#               "type": "regular"
-#             },
-#             {
-#               "name": "tags",
-#               "type": "multivalued"
-#             }
-#           ]
-#         },
-#         {
-#           "name": "Category",
-#           "type": "strong",
-#           "attributes": [
-#             {
-#               "name": "category_id",
-#               "type": "primary_key"
-#             },
-#             {
-#               "name": "name",
-#               "type": "regular"
-#             },
-#             {
-#               "name": "description",
-#               "type": "regular"
-#             }
-#           ]
-#         },
-#         {
-#           "name": "Order",
-#           "type": "strong",
-#           "attributes": [
-#             {
-#               "name": "order_id",
-#               "type": "primary_key"
-#             },
-#             {
-#               "name": "order_date",
-#               "type": "regular"
-#             },
-#             {
-#               "name": "status",
-#               "type": "regular"
-#             },
-#             {
-#               "name": "total_amount",
-#               "type": "derived"
-#             },
-#             {
-#               "name": "shipping_address",
-#               "type": "composite"
-#             }
-#           ]
-#         },
-#         {
-#           "name": "OrderItem",
-#           "type": "weak",
-#           "attributes": [
-#             {
-#               "name": "line_number",
-#               "type": "partial_key"
-#             },
-#             {
-#               "name": "quantity",
-#               "type": "regular"
-#             },
-#             {
-#               "name": "unit_price",
-#               "type": "regular"
-#             },
-#             {
-#               "name": "subtotal",
-#               "type": "derived"
-#             }
-#           ]
-#         },
-#         {
-#           "name": "Payment",
-#           "type": "strong",
-#           "attributes": [
-#             {
-#               "name": "payment_id",
-#               "type": "primary_key"
-#             },
-#             {
-#               "name": "amount",
-#               "type": "regular"
-#             },
-#             {
-#               "name": "payment_method",
-#               "type": "regular"
-#             },
-#             {
-#               "name": "payment_date",
-#               "type": "regular"
-#             },
-#             {
-#               "name": "status",
-#               "type": "regular"
-#             }
-#           ]
-#         },
-#         {
-#           "name": "Review",
-#           "type": "strong",
-#           "attributes": [
-#             {
-#               "name": "review_id",
-#               "type": "primary_key"
-#             },
-#             {
-#               "name": "rating",
-#               "type": "regular"
-#             },
-#             {
-#               "name": "comment",
-#               "type": "regular"
-#             },
-#             {
-#               "name": "review_date",
-#               "type": "regular"
-#             }
-#           ]
-#         },
-#         {
-#           "name": "Vendor",
-#           "type": "strong",
-#           "attributes": [
-#             {
-#               "name": "vendor_id",
-#               "type": "primary_key"
-#             },
-#             {
-#               "name": "company_name",
-#               "type": "regular"
-#             },
-#             {
-#               "name": "contact_person",
-#               "type": "regular"
-#             },
-#             {
-#               "name": "contact_emails",
-#               "type": "multivalued"
-#             },
-#             {
-#               "name": "business_address",
-#               "type": "composite"
-#             }
-#           ]
-#         },
-#         {
-#           "name": "ShoppingCart",
-#           "type": "strong",
-#           "attributes": [
-#             {
-#               "name": "cart_id",
-#               "type": "primary_key"
-#             },
-#             {
-#               "name": "created_date",
-#               "type": "regular"
-#             },
-#             {
-#               "name": "last_updated",
-#               "type": "regular"
-#             },
-#             {
-#               "name": "total_items",
-#               "type": "derived"
-#             }
-#           ]
-#         },
-#         {
-#           "name": "CartItem",
-#           "type": "weak",
-#           "attributes": [
-#             {
-#               "name": "item_position",
-#               "type": "partial_key"
-#             },
-#             {
-#               "name": "quantity",
-#               "type": "regular"
-#             },
-#             {
-#               "name": "added_date",
-#               "type": "regular"
-#             }
-#           ]
-#         }
-#       ],
-#       "relationships": [
-#         {
-#           "name": "PlacesOrder",
-#           "type": "regular",
-#           "entities": ["User", "Order"],
-#           "cardinalities": {
-#             "User": "1",
-#             "Order": "M"
-#           },
-#           "attributes": []
-#         },
-#         {
-#           "name": "Contains",
-#           "type": "identifying",
-#           "entities": ["Order", "OrderItem"],
-#           "cardinalities": {
-#             "Order": "1",
-#             "OrderItem": "M"
-#           },
-#           "attributes": []
-#         },
-#         {
-#           "name": "OrdersProduct",
-#           "type": "regular",
-#           "entities": ["OrderItem", "Product"],
-#           "cardinalities": {
-#             "OrderItem": "M",
-#             "Product": "1"
-#           },
-#           "attributes": []
-#         },
-#         {
-#           "name": "BelongsTo",
-#           "type": "regular",
-#           "entities": ["Product", "Category"],
-#           "cardinalities": {
-#             "Product": "M",
-#             "Category": "1"
-#           },
-#           "attributes": []
-#         },
-#         {
-#           "name": "ProcessesPayment",
-#           "type": "regular",
-#           "entities": ["Order", "Payment"],
-#           "cardinalities": {
-#             "Order": "1",
-#             "Payment": "M"
-#           },
-#           "attributes": []
-#         },
-#         {
-#           "name": "WritesReview",
-#           "type": "regular",
-#           "entities": ["User", "Review"],
-#           "cardinalities": {
-#             "User": "1",
-#             "Review": "M"
-#           },
-#           "attributes": []
-#         },
-#         {
-#           "name": "ReviewsProduct",
-#           "type": "regular",
-#           "entities": ["Review", "Product"],
-#           "cardinalities": {
-#             "Review": "M",
-#             "Product": "1"
-#           },
-#           "attributes": []
-#         },
-#         {
-#           "name": "Supplies",
-#           "type": "regular",
-#           "entities": ["Vendor", "Product"],
-#           "cardinalities": {
-#             "Vendor": "M",
-#             "Product": "M"
-#           },
-#           "attributes": [
-#             {
-#               "name": "supply_price"
-#             },
-#             {
-#               "name": "lead_time"
-#             }
-#           ]
-#         },
-#         {
-#           "name": "HasCart",
-#           "type": "regular",
-#           "entities": ["User", "ShoppingCart"],
-#           "cardinalities": {
-#             "User": "1",
-#             "ShoppingCart": "1"
-#           },
-#           "attributes": []
-#         },
-#         {
-#           "name": "CartContains",
-#           "type": "identifying",
-#           "entities": ["ShoppingCart", "CartItem"],
-#           "cardinalities": {
-#             "ShoppingCart": "1",
-#             "CartItem": "M"
-#           },
-#           "attributes": []
-#         },
-#         {
-#           "name": "CartHasProduct",
-#           "type": "regular",
-#           "entities": ["CartItem", "Product"],
-#           "cardinalities": {
-#             "CartItem": "M",
-#             "Product": "1"
-#           },
-#           "attributes": []
-#         }
-#       ]
-#     }
-
-#     Returns:
-#         str: The filepath to the generated PNG image file.
-#     """
-#     try:
-#         if not json_input.strip():
-#             return "Error: Empty input"
-            
-#         data = json.loads(json_input)
-        
-#         if 'entities' not in data:
-#             raise ValueError("Missing required field: entities")
-
-#         dot = graphviz.Graph(comment='ER Diagram', engine='neato')
-#         dot.attr(
-#             bgcolor='white',
-#             pad='1.5',
-#             overlap='false',
-#             splines='true',
-#             sep='+25',
-#             esep='+15'
-#         )
-#         dot.attr('node', fontname='Arial', fontsize='10', color='#404040')
-#         dot.attr('edge', fontname='Arial', fontsize='9', color='#4a4a4a')
-        
-#         entity_color = '#BEBEBE'        
-#         attribute_color = '#D4D4D4'     
-#         relationship_color = '#E8E8E8'  
-#         isa_color = '#F0F0F0'          
-        
-#         font_color = 'black'
-        
-#         entities = data.get('entities', [])
-#         relationships = data.get('relationships', [])
-        
-#         # Process entities with new styling
-#         for entity in entities:
-#             entity_name = entity.get('name')
-#             entity_type = entity.get('type', 'strong')
-#             attributes = entity.get('attributes', [])
-            
-#             if not entity_name:
-#                 continue
-            
-#             if entity_type == 'weak':
-#                 dot.node(
-#                     entity_name, 
-#                     entity_name, 
-#                     shape='box', 
-#                     style='filled,rounded',
-#                     fillcolor=entity_color,  
-#                     fontcolor=font_color,
-#                     color='#404040',
-#                     penwidth='3',
-#                     width='1.8',
-#                     height='0.8',
-#                     fontsize='12'
-#                 )
-#             else:
-#                 dot.node(
-#                     entity_name, 
-#                     entity_name, 
-#                     shape='box', 
-#                     style='filled,rounded',
-#                     fillcolor=entity_color,  
-#                     fontcolor=font_color,
-#                     color='#404040',
-#                     penwidth='1',
-#                     width='1.8',
-#                     height='0.8',
-#                     fontsize='12'
-#                 )
-            
-#             for i, attr in enumerate(attributes):
-#                 attr_name = attr.get('name', '')
-#                 attr_type = attr.get('type', 'regular')
-                
-#                 attr_id = f"{entity_name}_attr_{i}"
-                
-#                 if attr_type == 'primary_key':
-#                     dot.node(
-#                         attr_id, 
-#                         f'{attr_name} (PK)', 
-#                         shape='ellipse', 
-#                         style='filled,rounded',
-#                         fillcolor=attribute_color,  
-#                         fontcolor=font_color,
-#                         color='#404040',
-#                         width='1.2',
-#                         height='0.6',
-#                         fontsize='10'
-#                     )
-#                 elif attr_type == 'partial_key':
-#                     dot.node(
-#                         attr_id, 
-#                         f'{attr_name} (Partial)', 
-#                         shape='ellipse', 
-#                         style='filled,rounded,dashed',
-#                         fillcolor=attribute_color,  
-#                         fontcolor=font_color,
-#                         color='#404040',
-#                         width='1.2',
-#                         height='0.6',
-#                         fontsize='10'
-#                     )
-#                 elif attr_type == 'multivalued':
-#                     dot.node(
-#                         attr_id, 
-#                         attr_name, 
-#                         shape='ellipse', 
-#                         style='filled,rounded',
-#                         fillcolor=attribute_color,  
-#                         fontcolor=font_color,
-#                         color='#404040',
-#                         penwidth='3',
-#                         width='1.2',
-#                         height='0.6',
-#                         fontsize='10'
-#                     )
-#                 elif attr_type == 'derived':
-#                     dot.node(
-#                         attr_id, 
-#                         f'/{attr_name}/', 
-#                         shape='ellipse', 
-#                         style='filled,rounded,dashed',
-#                         fillcolor=attribute_color,  
-#                         fontcolor=font_color,
-#                         color='#404040',
-#                         width='1.2',
-#                         height='0.6',
-#                         fontsize='10'
-#                     )
-#                 elif attr_type == 'composite':
-#                     dot.node(
-#                         attr_id, 
-#                         attr_name, 
-#                         shape='ellipse', 
-#                         style='filled,rounded',
-#                         fillcolor=attribute_color,  
-#                         fontcolor=font_color,
-#                         color='#404040',
-#                         width='1.2',
-#                         height='0.6',
-#                         fontsize='10'
-#                     )
-#                 else:  
-#                     dot.node(
-#                         attr_id, 
-#                         attr_name, 
-#                         shape='ellipse', 
-#                         style='filled,rounded',
-#                         fillcolor=attribute_color,  
-#                         fontcolor=font_color,
-#                         color='#404040',
-#                         width='1.2',
-#                         height='0.6',
-#                         fontsize='10'
-#                     )
-                
-#                 dot.edge(entity_name, attr_id, color='#4a4a4a', len='1.5')
-        
-#         for relationship in relationships:
-#             rel_name = relationship.get('name')
-#             rel_type = relationship.get('type', 'regular')
-#             entities_involved = relationship.get('entities', [])
-#             cardinalities = relationship.get('cardinalities', {})
-#             rel_attributes = relationship.get('attributes', [])
-            
-#             if not rel_name:
-#                 continue
-            
-#             if rel_type == 'isa':
-#                 parent = relationship.get('parent')
-#                 children = relationship.get('children', [])
-                
-#                 if parent and children:
-#                     isa_id = f"isa_{rel_name}"
-                    
-#                     dot.node(
-#                         isa_id, 
-#                         'ISA', 
-#                         shape='triangle', 
-#                         style='filled,rounded',
-#                         fillcolor=isa_color,  
-#                         fontcolor=font_color,
-#                         color='#404040',
-#                         penwidth='2',
-#                         width='1.0',
-#                         height='0.8',
-#                         fontsize='10'
-#                     )
-                    
-#                     dot.edge(parent, isa_id, color='#4a4a4a', len='2.0')
-                    
-#                     for child in children:
-#                         dot.edge(isa_id, child, color='#4a4a4a', len='2.0')
-                
-#             elif len(entities_involved) >= 2:
-#                 if rel_type == 'identifying':
-#                     dot.node(
-#                         rel_name, 
-#                         rel_name, 
-#                         shape='diamond', 
-#                         style='filled,rounded',
-#                         fillcolor=relationship_color,  
-#                         fontcolor=font_color,
-#                         color='#404040',
-#                         penwidth='3',
-#                         width='1.8',
-#                         height='1.0',
-#                         fontsize='11'
-#                     )
-#                 else:
-#                     dot.node(
-#                         rel_name, 
-#                         rel_name, 
-#                         shape='diamond', 
-#                         style='filled,rounded',
-#                         fillcolor=relationship_color,  
-#                         fontcolor=font_color,
-#                         color='#404040',
-#                         penwidth='1',
-#                         width='1.8',
-#                         height='1.0',
-#                         fontsize='11'
-#                     )
-                
-#                 for j, attr in enumerate(rel_attributes):
-#                     attr_name = attr.get('name', '')
-#                     attr_id = f"{rel_name}_attr_{j}"
-                    
-#                     dot.node(
-#                         attr_id, 
-#                         attr_name, 
-#                         shape='ellipse', 
-#                         style='filled,rounded',
-#                         fillcolor=attribute_color,  
-#                         fontcolor=font_color,
-#                         color='#404040',
-#                         width='1.0',
-#                         height='0.5',
-#                         fontsize='9'
-#                     )
-#                     dot.edge(rel_name, attr_id, color='#4a4a4a', len='1.0')
-                
-#                 for entity in entities_involved:
-#                     cardinality = cardinalities.get(entity, '1')
-#                     dot.edge(
-#                         entity, 
-#                         rel_name, 
-#                         label=f' {cardinality} ',
-#                         color='#4a4a4a',
-#                         len='2.5',
-#                         fontcolor='#4a4a4a',
-#                         fontsize='10'
-#                     )
-
-#         with NamedTemporaryFile(delete=False, suffix=f'.{output_format}') as tmp:
-#             dot.render(tmp.name, format=output_format, cleanup=True)
-#             return f"{tmp.name}.{output_format}"
-
-#     except json.JSONDecodeError:
-#         return "Error: Invalid JSON format"
-#     except Exception as e:
-#         return f"Error: {str(e)}"
-
 import graphviz
 import json
 from tempfile import NamedTemporaryFile
@@ -662,156 +15,406 @@ def generate_entity_relationship_diagram(json_input: str, output_format: str) ->
     {
       "entities": [
         {
-          "name": "User",
+          "name": "Person",
           "type": "strong",
           "attributes": [
             {
-              "name": "user_id",
+              "name": "person_id",
               "type": "primary_key"
             },
             {
-              "name": "username",
+              "name": "first_name",
               "type": "regular"
             },
             {
-              "name": "email",
+              "name": "last_name",
               "type": "regular"
             },
             {
-              "name": "password_hash",
+              "name": "birth_date",
               "type": "regular"
             },
             {
-              "name": "full_name",
-              "type": "composite"
+              "name": "age",
+              "type": "derived"
             },
             {
               "name": "phone_numbers",
               "type": "multivalued"
             },
             {
-              "name": "age",
+              "name": "full_address",
+              "type": "composite"
+            }
+          ]
+        },
+        {
+          "name": "Student",
+          "type": "strong",
+          "attributes": [
+            {
+              "name": "student_number",
+              "type": "regular"
+            },
+            {
+              "name": "enrollment_date",
+              "type": "regular"
+            },
+            {
+              "name": "gpa",
               "type": "derived"
             }
           ]
         },
         {
-          "name": "Product",
+          "name": "UndergraduateStudent",
           "type": "strong",
           "attributes": [
             {
-              "name": "product_id",
-              "type": "primary_key"
+              "name": "major",
+              "type": "regular"
+            },
+            {
+              "name": "expected_graduation",
+              "type": "regular"
+            },
+            {
+              "name": "credits_completed",
+              "type": "regular"
+            }
+          ]
+        },
+        {
+          "name": "GraduateStudent",
+          "type": "strong",
+          "attributes": [
+            {
+              "name": "thesis_topic",
+              "type": "regular"
+            },
+            {
+              "name": "advisor_id",
+              "type": "regular"
+            },
+            {
+              "name": "degree_type",
+              "type": "regular"
+            }
+          ]
+        },
+        {
+          "name": "Faculty",
+          "type": "strong",
+          "attributes": [
+            {
+              "name": "employee_number",
+              "type": "regular"
             },
             {
-              "name": "name",
+              "name": "hire_date",
               "type": "regular"
             },
             {
-              "name": "description",
+              "name": "office_number",
               "type": "regular"
             },
             {
-              "name": "price",
+              "name": "years_of_service",
+              "type": "derived"
+            }
+          ]
+        },
+        {
+          "name": "Professor",
+          "type": "strong",
+          "attributes": [
+            {
+              "name": "rank",
               "type": "regular"
             },
             {
-              "name": "stock_quantity",
+              "name": "tenure_status",
               "type": "regular"
             },
             {
-              "name": "tags",
+              "name": "research_areas",
               "type": "multivalued"
             }
           ]
         },
         {
-          "name": "Category",
+          "name": "Lecturer",
           "type": "strong",
           "attributes": [
             {
-              "name": "category_id",
-              "type": "primary_key"
+              "name": "contract_type",
+              "type": "regular"
+            },
+            {
+              "name": "courses_per_semester",
+              "type": "regular"
+            }
+          ]
+        },
+        {
+          "name": "Staff",
+          "type": "strong",
+          "attributes": [
+            {
+              "name": "position_title",
+              "type": "regular"
             },
             {
-              "name": "name",
+              "name": "department_assigned",
               "type": "regular"
             },
             {
-              "name": "description",
+              "name": "salary_grade",
+              "type": "regular"
+            }
+          ]
+        },
+        {
+          "name": "AdministrativeStaff",
+          "type": "strong",
+          "attributes": [
+            {
+              "name": "access_level",
               "type": "regular"
+            },
+            {
+              "name": "responsibilities",
+              "type": "multivalued"
             }
           ]
         },
         {
-          "name": "Order",
+          "name": "TechnicalStaff",
           "type": "strong",
           "attributes": [
             {
-              "name": "order_id",
+              "name": "certifications",
+              "type": "multivalued"
+            },
+            {
+              "name": "equipment_assigned",
+              "type": "multivalued"
+            }
+          ]
+        },
+        {
+          "name": "Vehicle",
+          "type": "strong",
+          "attributes": [
+            {
+              "name": "vehicle_id",
               "type": "primary_key"
             },
             {
-              "name": "order_date",
+              "name": "license_plate",
               "type": "regular"
             },
             {
-              "name": "status",
+              "name": "year",
               "type": "regular"
             },
             {
-              "name": "total_amount",
+              "name": "current_value",
               "type": "derived"
+            }
+          ]
+        },
+        {
+          "name": "Car",
+          "type": "strong",
+          "attributes": [
+            {
+              "name": "doors",
+              "type": "regular"
             },
             {
-              "name": "shipping_address",
-              "type": "composite"
+              "name": "fuel_type",
+              "type": "regular"
             }
           ]
         },
         {
-          "name": "OrderItem",
-          "type": "weak",
+          "name": "Bus",
+          "type": "strong",
           "attributes": [
             {
-              "name": "line_number",
-              "type": "partial_key"
+              "name": "capacity",
+              "type": "regular"
             },
             {
-              "name": "quantity",
+              "name": "route_assigned",
+              "type": "regular"
+            }
+          ]
+        },
+        {
+          "name": "MaintenanceVehicle",
+          "type": "strong",
+          "attributes": [
+            {
+              "name": "equipment_type",
               "type": "regular"
             },
             {
-              "name": "unit_price",
+              "name": "specialized_tools",
+              "type": "multivalued"
+            }
+          ]
+        },
+        {
+          "name": "Course",
+          "type": "strong",
+          "attributes": [
+            {
+              "name": "course_id",
+              "type": "primary_key"
+            },
+            {
+              "name": "course_name",
               "type": "regular"
             },
             {
-              "name": "subtotal",
-              "type": "derived"
+              "name": "credits",
+              "type": "regular"
+            }
+          ]
+        },
+        {
+          "name": "Department",
+          "type": "strong",
+          "attributes": [
+            {
+              "name": "dept_id",
+              "type": "primary_key"
+            },
+            {
+              "name": "dept_name",
+              "type": "regular"
+            },
+            {
+              "name": "budget",
+              "type": "regular"
             }
           ]
         }
       ],
       "relationships": [
         {
-          "name": "PlacesOrder",
+          "name": "PersonISA",
+          "type": "isa",
+          "parent": "Person",
+          "children": ["Student", "Faculty", "Staff"]
+        },
+        {
+          "name": "StudentISA",
+          "type": "isa",
+          "parent": "Student",
+          "children": ["UndergraduateStudent", "GraduateStudent"]
+        },
+        {
+          "name": "FacultyISA",
+          "type": "isa",
+          "parent": "Faculty",
+          "children": ["Professor", "Lecturer"]
+        },
+        {
+          "name": "StaffISA",
+          "type": "isa",
+          "parent": "Staff",
+          "children": ["AdministrativeStaff", "TechnicalStaff"]
+        },
+        {
+          "name": "VehicleISA",
+          "type": "isa",
+          "parent": "Vehicle",
+          "children": ["Car", "Bus", "MaintenanceVehicle"]
+        },
+        {
+          "name": "Enrolls",
           "type": "regular",
-          "entities": ["User", "Order"],
+          "entities": ["Student", "Course"],
           "cardinalities": {
-            "User": "1",
-            "Order": "M"
+            "Student": "M",
+            "Course": "M"
           },
-          "attributes": []
+          "attributes": [
+            {
+              "name": "semester"
+            },
+            {
+              "name": "year"
+            },
+            {
+              "name": "grade"
+            }
+          ]
         },
         {
-          "name": "Contains",
-          "type": "identifying",
-          "entities": ["Order", "OrderItem"],
+          "name": "Teaches",
+          "type": "regular",
+          "entities": ["Faculty", "Course"],
           "cardinalities": {
-            "Order": "1",
-            "OrderItem": "M"
+            "Faculty": "M",
+            "Course": "M"
           },
-          "attributes": []
+          "attributes": [
+            {
+              "name": "semester"
+            },
+            {
+              "name": "classroom"
+            }
+          ]
+        },
+        {
+          "name": "WorksIn",
+          "type": "regular",
+          "entities": ["Faculty", "Department"],
+          "cardinalities": {
+            "Faculty": "M",
+            "Department": "1"
+          },
+          "attributes": [
+            {
+              "name": "start_date"
+            }
+          ]
+        },
+        {
+          "name": "Manages",
+          "type": "regular",
+          "entities": ["Staff", "Department"],
+          "cardinalities": {
+            "Staff": "M",
+            "Department": "M"
+          },
+          "attributes": [
+            {
+              "name": "role"
+            }
+          ]
+        },
+        {
+          "name": "Uses",
+          "type": "regular",
+          "entities": ["Staff", "Vehicle"],
+          "cardinalities": {
+            "Staff": "M",
+            "Vehicle": "M"
+          },
+          "attributes": [
+            {
+              "name": "usage_date"
+            },
+            {
+              "name": "purpose"
+            }
+          ]
         }
       ]
     }