[
	{
		"id": "1",
		"shape": "er-rect",
		"label": "学生",
		"width": 150,
		"height": 24,
		"position": {
			"x": 24,
			"y": 150
		},
		"ports": [
			{
				"id": "1-1",
				"group": "list",
				"attrs": {
					"portNameLabel": {
						"text": "ID"
					},
					"portTypeLabel": {
						"text": "STRING"
					}
				}
			},
			{
				"id": "1-2",
				"group": "list",
				"attrs": {
					"portNameLabel": {
						"text": "Name"
					},
					"portTypeLabel": {
						"text": "STRING"
					}
				}
			},
			{
				"id": "1-3",
				"group": "list",
				"attrs": {
					"portNameLabel": {
						"text": "Class"
					},
					"portTypeLabel": {
						"text": "NUMBER"
					}
				}
			},
			{
				"id": "1-4",
				"group": "list",
				"attrs": {
					"portNameLabel": {
						"text": "Gender"
					},
					"portTypeLabel": {
						"text": "BOOLEAN"
					}
				}
			}
		]
	},
	{
		"id": "2",
		"shape": "er-rect",
		"label": "课程",
		"width": 150,
		"height": 24,
		"position": {
			"x": 250,
			"y": 210
		},
		"ports": [
			{
				"id": "2-1",
				"group": "list",
				"attrs": {
					"portNameLabel": {
						"text": "ID"
					},
					"portTypeLabel": {
						"text": "STRING"
					}
				}
			},
			{
				"id": "2-2",
				"group": "list",
				"attrs": {
					"portNameLabel": {
						"text": "Name"
					},
					"portTypeLabel": {
						"text": "STRING"
					}
				}
			},
			{
				"id": "2-3",
				"group": "list",
				"attrs": {
					"portNameLabel": {
						"text": "StudentID"
					},
					"portTypeLabel": {
						"text": "STRING"
					}
				}
			},
			{
				"id": "2-4",
				"group": "list",
				"attrs": {
					"portNameLabel": {
						"text": "TeacherID"
					},
					"portTypeLabel": {
						"text": "STRING"
					}
				}
			},
			{
				"id": "2-5",
				"group": "list",
				"attrs": {
					"portNameLabel": {
						"text": "Description"
					},
					"portTypeLabel": {
						"text": "STRING"
					}
				}
			}
		]
	},
	{
		"id": "3",
		"shape": "er-rect",
		"label": "老师",
		"width": 150,
		"height": 24,
		"position": {
			"x": 480,
			"y": 350
		},
		"ports": [
			{
				"id": "3-1",
				"group": "list",
				"attrs": {
					"portNameLabel": {
						"text": "ID"
					},
					"portTypeLabel": {
						"text": "STRING"
					}
				}
			},
			{
				"id": "3-2",
				"group": "list",
				"attrs": {
					"portNameLabel": {
						"text": "Name"
					},
					"portTypeLabel": {
						"text": "STRING"
					}
				}
			},
			{
				"id": "3-3",
				"group": "list",
				"attrs": {
					"portNameLabel": {
						"text": "Age"
					},
					"portTypeLabel": {
						"text": "NUMBER"
					}
				}
			}
		]
	},
	{
		"id": "4",
		"shape": "edge",
		"source": {
			"cell": "1",
			"port": "1-1"
		},
		"target": {
			"cell": "2",
			"port": "2-3"
		},
		"attrs": {
			"line": {
				"stroke": "#A2B1C3",
				"strokeWidth": 2
			}
		},
		"zIndex": 0
	},
	{
		"id": "5",
		"shape": "edge",
		"source": {
			"cell": "3",
			"port": "3-1"
		},
		"target": {
			"cell": "2",
			"port": "2-4"
		},
		"attrs": {
			"line": {
				"stroke": "#A2B1C3",
				"strokeWidth": 2
			}
		},
		"zIndex": 0
	}
]