Document that defines the hierarchy macro, which displays and allows to edit the documents hierarchy in a specific space (the standard parent-child relation) along with a special information, children order, which is saved in each parent to allow ordering its children as set by the user when displayed with this macro (and whenever some code which is aware of this information uses it).

Note that the children order information should be used as a relative order, since a document can have additional children which are not present in the order information, as the order information is not updated when the parent parents / children are changed through other means than this macro. In such situations, hierarchy macro uses the stored children order for a document as follows:

• for all the documents which are in the stored order, if they are an actual child of the document, they are displayed, as they appear in the stored order
• for all the actual children of the document in alphabetic order of their display values (with a special case for the displayTitle), if they have not been yet displayed, they are displayed.
  Thus, children in the stored order will appear first, as dictated by the order, followed by the children for which there is no order information.