Add absence of dependencies as principle.

README.org

@@ -7,6 +7,12 @@ A python library to parse, modify and save Org-mode files.
 - Modify these data and write it back to disk.
 - Keep the original structure intact (indentation, spaces, format, ...).
 
+** Principles
+- Avoid any dependency outside of Python's standard library.
+- Don't do anything outside of the scope of parsing/re-serializing Org-mode files.
+- *Modification of the original text if there's no change is considered a bug (see [[id:7363ba38-1662-4d3c-9e83-0999824975b7][Known issues]]).*
+- Data structures should be exposed as it's read on Emacs's org-mode or when in doubt as raw as possible.
+- Data in the objects should be modificable as a way to update the document itself. *Consider this a Object-oriented design.*
 ** Safety mechanism
 As this library is still in early development. Running it over files might
 produce unexpected changes on them. For this reason it's heavily recommended to
@@ -21,6 +27,9 @@ Also, see [[id:76e77f7f-c9e0-4c83-ad2f-39a5a8894a83][Known issues:Structure modi
 not properly stored and can trigger this safety mechanism on a false-positive.
 
 * Known issues
+:PROPERTIES:
+:ID:       7363ba38-1662-4d3c-9e83-0999824975b7
+:END:
 ** Structure modifications
 :PROPERTIES:
 :ID:       76e77f7f-c9e0-4c83-ad2f-39a5a8894a83

requirements.txt

@@ -1 +0,0 @@
-# No external requirements at this point