Update README.md

README.md

@@ -63,6 +63,16 @@ i.e. the task of adding spaces between the words on a identifier.
 - `language`: the programming language of the source.
 - `source`: the source of the identifier.
 
+## Dataset Creation
+
+- All hashtag segmentation and identifier splitting datasets on this profile have the same basic fields: `hashtag` and `segmentation` or `identifier` and `segmentation`.
+
+- The only difference between `hashtag` and `segmentation` or between `identifier` and `segmentation` are the whitespace characters. Spell checking, expanding abbreviations or correcting characters to uppercase go into other fields.
+
+- There is always whitespace between an alphanumeric character and a sequence of any special characters ( such as `_` , `:`, `~` ). 
+
+- If there are any annotations for named entity recognition and other token classification tasks, they are given in a `spans` field.
+
 ### Citation Information
 
 ```