add yaml

requirements.txt

@@ -3,3 +3,4 @@ pymupdf==1.25.5
 PyPDF2==3.0.1
 python-dotenv==1.1.0
 tiktoken==0.7.0
+pyyaml==6.0.2

results/four-lectures_structure.json

@@ -2,10 +2,11 @@
   "doc_name": "four-lectures.pdf",
   "structure": [
     {
-      "title": "Four Lectures on Standard ML",
+      "title": "Preface",
       "start_index": 1,
       "end_index": 1,
-      "nodes": [
+      "node_id": "0000"
+    },
     {
       "title": "ML at a Glance",
       "start_index": 2,
@@ -73,9 +74,6 @@
         }
       ],
       "node_id": "0001"
-        }
-      ],
-      "node_id": "0000"
     },
     {
       "title": "Programming with ML Modules",
@@ -266,14 +264,70 @@
     {
       "title": "Appendix A: The Bare Interpreter",
       "start_index": 44,
+      "end_index": 44,
+      "nodes": [
+        {
+          "title": "Syntax",
+          "start_index": 44,
+          "end_index": 44,
+          "node_id": "0043"
+        },
+        {
+          "title": "Parsing",
+          "start_index": 44,
+          "end_index": 45,
+          "node_id": "0044"
+        },
+        {
+          "title": "Environments",
+          "start_index": 45,
+          "end_index": 45,
+          "node_id": "0045"
+        },
+        {
+          "title": "Evaluation",
+          "start_index": 45,
+          "end_index": 46,
+          "node_id": "0046"
+        },
+        {
+          "title": "Type Checking",
+          "start_index": 46,
+          "end_index": 46,
+          "node_id": "0047"
+        },
+        {
+          "title": "The Interpreter",
+          "start_index": 46,
+          "end_index": 47,
+          "node_id": "0048"
+        },
+        {
+          "title": "The Evaluator",
+          "start_index": 47,
+          "end_index": 48,
+          "node_id": "0049"
+        },
+        {
+          "title": "The Typechecker",
+          "start_index": 48,
+          "end_index": 49,
+          "node_id": "0050"
+        },
+        {
+          "title": "The Basics",
+          "start_index": 50,
           "end_index": 52,
+          "node_id": "0051"
+        }
+      ],
       "node_id": "0042"
     },
     {
       "title": "Appendix B: Files",
       "start_index": 53,
       "end_index": 53,
-      "node_id": "0043"
+      "node_id": "0052"
     }
   ]
 }