Editor for creating the tree structure. The right side of the screen shows the properties associated with the selected node 'body height'. 'Minimum' and 'Maximum' indicate the plausible range for body height. A condition is added to accommodate rare, but potentially valid values. The 'Codes' field can be used to assign identifiers from one or more standard terminologies. Each node is displayed with its associated term from the thesaurus. Unique numeric identifiers are meaningless and hidden. These can be shown on demand.