#2 EDI Parser

[Kent Vogel]

A low level EDI message parser/builder.

Initial implenetation would be a low level parser that
simply found the Interchanges, Segments, Functional
Groups, Elements and SubElements, and fired
corresponding events.

The corresponding builder would do the reverse,
building EDI messages from a client firing events.

Later additions could be:

1) An Adapter that transformed the EDI events to SAX
events.
2) An Adapter that transformed SAX events to EDI events.
3) An EDI Interchange DOM
4) Type-aware DOMs for specific functional groups (e.g.
850 PO, 810 Invoice)

For 1 and 2, some generalized XML format would need to
be chosen.

For 3 and 4, it might be better to first create
'type-aware' event interfaces for the specific
documents . Like

public interface EDI850EventHandler {

public void startLineItem(...);
public void endLineItem(...);
...
}