This contains a set of 9 text attributes of varying data types (Boolean, Color, Date, List, Number, Set, String). The attribute names use a common prefix 'My', e.g. $MyString. These attributes are very useful for initial testing and incremental formalisation of projects. For pre-v6 documents which may have same-named/typed attributes already defined as user attributes, these will still work as before but said attributes will be accessed via the Sandbox group of system attributes.