added the first 3 record definitions

fields.py

@@ -5,11 +5,12 @@ class ValidationError(Exception):
 class Field(object):
     creation_counter = 0
 
-    def __init__(self, name=None, max_length=0, required=True):
+    def __init__(self, name=None, max_length=0, required=True, uppercase=True):
         self.name = name
         self._value = None
         self.max_length = max_length
         self.required = required
+        self.uppercase = uppercase
         self.creation_counter = Field.creation_counter
         Field.creation_counter += 1
 
@@ -30,7 +31,6 @@ class Field(object):
     def __repr__(self):
         return self.name
 
-
 class TextField(Field):    
     def validate(self):
         if self.value == None and self.required:
@@ -39,12 +39,44 @@ class TextField(Field):
             raise ValidationError("value is too long")
 
     def get_data(self):
-        return (self.value or "").encode('ascii').ljust(self.max_length)
+        value = self.value or ""
+        if self.uppercase:
+            value = value.upper()
+        return value.ljust(self.max_length).encode('ascii')
 
 class StateField(TextField):
     def __init__(self, name=None, required=True):
         return super(StateField, self).__init__(name=name, max_length=2, required=required)
 
+class EmailField(TextField):
+    def __init__(self, name=None, required=True, max_length=None):
+        return super(EmailField, self).__init__(name=name, max_length=max_length, 
+                                                required=required, uppercase=False)
+class NumericField(TextField):
+    def validate(self):
+        super(NumericField, self).validate()
+        try:
+            int(self.value)
+        except ValueError:
+            raise ValidationError("field contains non-numeric characters")
+        
+class StaticField(TextField):
+    def __init__(self, name=None, required=True, value=None):
+        super(StaticField, self).__init__(name=name, required=required,
+                                            max_length=len(value))
+        self._value = value
+
+class BlankField(TextField):
+    def get_data(self):
+        return " " * self.max_length
+
+class BooleanField(Field):
+    def validate(self):
+        pass
+
+    def get_data(self):
+        return '1' if self._value else '0'
+
 class MoneyField(Field):
     def validate(self):
         if self.value == None and self.required: