#1 Implement quering system using object database

[Audrius Meskauskas]

The the result of work of Sight workflow engine is a tree
of connected records. Currently this structure is written
to the nested html document, creating some ilusion of
the convenient report. However in reality it should be
queried by the object database engine like, for example,
db4o (http://www.db4o.com/). Out system is GPL and
we can only use open source databases under GPL
license for this task.

There are only two types of nodes. The request node is
a class with public defined or inherited string fields. The
result node describes the result to some request and
contains a single public array of records. These records
also contain public defined or inherited string fields. The
format of writing this into persistent form would be a
matter of agreement.

The suggested application could be completely
independent from the rest of the Sight, just taking the
output file. It should query objects by the fields value,
by the fields of ancestor node and by fields of the child
(result) node. User friendly GUI interface would be
preferred, but the possibility to query in console mode
with some SQL-like language can also be discussed.