se implementa un esquema para modelar el xml

FossilOrigin-Name: e4de658f60fe8fcbb330923e14958a5d8f8e0e6395db4f992ec7da45062fa193

facho/model/__init__.py

@@ -0,0 +1,62 @@
+
+class ModelMeta(type):
+    def __new__(cls, name, bases, ns):
+        new = type.__new__(cls, name, bases, ns)
+        if '__name__' in ns:
+            new.__name__ = ns['__name__']
+        if '__namespace__' in ns:
+            new.__namespace__ = ns['__namespace__']
+        else:
+            new.__namespace__ = {}
+            
+        return new
+
+class ModelBase(object, metaclass=ModelMeta):
+
+    def __new__(cls, *args, **kwargs):
+        obj = super().__new__(cls, *args, **kwargs)
+        obj._xml_attributes = {}
+        obj._fields = {}
+        obj._text = ""
+        obj._namespace_prefix = None
+        
+        return obj
+
+    def __setitem__(self, key, val):
+        self._xml_attributes[key] = val
+
+    def __getitem__(self, key):
+        return self._xml_attributes[key]
+
+    def to_xml(self):
+        tag = self.__name__
+        ns = ''
+        if self._namespace_prefix is not None:
+            ns = "%s:" % (self._namespace_prefix)
+
+        pair_attributes = ["%s=\"%s\"" % (k, v) for (k, v) in self._xml_attributes.values()]
+
+        for (prefix, url) in self.__namespace__.items():
+            pair_attributes.append("xmlns:%s=\"%s\"" % (prefix, url))
+        attributes = ""
+        if pair_attributes:
+            attributes = " " + " ".join(pair_attributes)
+
+        content = ""
+
+        for name, value in self._fields.items():
+            if hasattr(value, 'to_xml'):
+                print(self._fields)
+                content += value.to_xml()
+            elif isinstance(value, str):
+                content += value
+        content += self._text
+
+        if content == "":
+            return "<%s%s%s/>" % (ns, tag, attributes)
+        else:
+            return "<%s%s%s>%s</%s%s>" % (ns, tag, attributes, content, ns, tag)
+
+class Model(ModelBase):
+    pass
+