fix: rm other attr in mathml

app/services/converter.py

@@ -340,9 +340,10 @@ class Converter:
         """Post-process MathML to improve Word compatibility.
         
         Applies transformations to make MathML more compatible with Word:
+        - Remove <semantics> and <annotation> wrappers (Word doesn't need them)
         - Change display="inline" to display="block" for better rendering
         - Decode Unicode entities to actual characters (Word prefers this)
-        - Clean up unnecessary attributes
+        - Ensure proper namespace
         
         Args:
             mathml: MathML string.
@@ -350,23 +351,57 @@ class Converter:
         Returns:
             Word-compatible MathML string.
         """
-        # Change display to block for better Word rendering
+        import re
+        
+        # Step 1: Remove <semantics> and <annotation> wrappers
+        # These often cause Word import issues
+        if '<semantics>' in mathml:
+            # Extract content between <semantics> and <annotation>
+            match = re.search(r'<semantics>(.*?)<annotation', mathml, re.DOTALL)
+            if match:
+                content = match.group(1).strip()
+                
+                # Get the math element attributes
+                math_attrs = ""
+                math_match = re.search(r'<math([^>]*)>', mathml)
+                if math_match:
+                    math_attrs = math_match.group(1)
+                
+                # Rebuild without semantics
+                mathml = f'<math{math_attrs}>{content}</math>'
+        
+        # Step 2: Change display to block for better Word rendering
         mathml = mathml.replace('display="inline"', 'display="block"')
         
-        # If no display attribute, add it
+        # Step 3: If no display attribute, add it
         if 'display=' not in mathml and '<math' in mathml:
             mathml = mathml.replace('<math', '<math display="block"', 1)
         
-        # Decode common Unicode entities to actual characters (Word prefers this)
+        # Step 4: Ensure xmlns is present
+        if 'xmlns=' not in mathml and '<math' in mathml:
+            mathml = mathml.replace('<math', '<math xmlns="http://www.w3.org/1998/Math/MathML"', 1)
+        
+        # Step 5: Decode common Unicode entities to actual characters (Word prefers this)
         unicode_map = {
             '&#x0002B;': '+',
-            '&#x02026;': '⋯',
-            '&#x022EE;': '⋮',
+            '&#x0002D;': '-',
+            '&#x0002A;': '*',
+            '&#x0002F;': '/',
             '&#x0003D;': '=',
-            '&#x0007C;': '|',
-            '&#x0002C;': ',',
+            '&#x0003C;': '<',
+            '&#x0003E;': '>',
             '&#x00028;': '(',
             '&#x00029;': ')',
+            '&#x0002C;': ',',
+            '&#x0002E;': '.',
+            '&#x0007C;': '|',
+            '&#x02026;': '⋯',
+            '&#x022EE;': '⋮',
+            '&#x022EF;': '⋯',
+            '&#x00B0;': '°',
+            '&#x03B3;': 'γ',
+            '&#x03C6;': 'φ',
+            '&#x03D5;': 'ϕ',
         }
         
         for entity, char in unicode_map.items():