facho/facho.py (FachoXML): se simplifica adicion de extension

FossilOrigin-Name: d939f6486757338766762589965955cd9a9a0a84aaad4c37a848f544d8119ab2

facho/facho.py

@@ -131,16 +131,8 @@ class FachoXML:
         self.builder.append(elem, new_elem)
         
     def add_extension(self, extension):
-        root_tag = self.builder.get_tag(self.root)
+        extension.build(self)
 
-        # construir las extensiones o adicionar en caso de indicar
-        xpath, elements = extension.build(self)
-        if isinstance(elements, str):
-            elem = self.set_element('/'+ root_tag + xpath, elements)
-        else:
-            for new_element in elements:
-                elem = self.find_or_create_element('/' + root_tag + xpath)
-                self.builder.append(elem, new_element)
     
     def fragment(self, xpath, append=False, append_not_exists=False):
         nodes = xpath.split('/')