added support for xml schemas

schema.py

@@ -5,12 +5,13 @@ import yaml
 from config import Config
 from renderer import Renderer
 from structure import Structure
+from xml_loader import XMLLoader
 
 class UnsupportedFormatException(Exception):
     ...
 
 class InstructionSetSchema:
-    VALID_EXTENSIONS = ("yaml", "json")
+    VALID_EXTENSIONS = ("yaml", "json", "xml")
     
     def __init__(self, path: str, configPath: str = "config.json") -> None:
         self.config = Config(configPath)
@@ -31,6 +32,9 @@ class InstructionSetSchema:
         
             elif ext == "json":
                 schema = json.load(f)
+            
+            elif ext == "xml":
+                schema = XMLLoader.load(f)
 
         self.structures = {}