Document template descriptor context objects can refer to earlier context object symbols

In version 9.0, with document template descriptor definitions, Gosu expressions in context object definitions can refer to symbols from previously-defined context objects.

For example, suppose the XML file that defines a document template descriptor creates context objects in the following order: Recipient1, Recipient2, Recipient3. The definition for Recipient2 can contain a Gosu expression that references the symbol Recipient1. Similarly, the definition for Recipient3 can contain a Gosu expression that references the symbol Recipient1 or Recipient2.