To Do
-----

- Output WKT from CRS.
- Error handling on the parser. How do we fail?
- Handle un-quoted strings.
- Handle single-quoted strings.
- Output proj4 text from CRS.
- Construct PROJ4 PJ from CRS*
  - Generic coordinate transformation API
  - Add other engines (CSMAP)
- "Standardize" CRS contents
- Instantiate CRS* from EPSG database
  - PgSQL 
  - PgSQL SPI
  - SQLLite
  

Useful Web References
---------------------

Complete WKT BNF
http://geoapi.sourceforge.net/snapshot/javadoc/org/opengis/referencing/doc-files/WKT.html

GDAL WKT quirks and issues
http://home.gdal.org/projects/opengis/wktproblems.html

GML CRS profile
http://www.opengeospatial.org/standards/requests/27

FLEX/BISON tutorials
http://ashimg.tripod.com/example.html
http://www.geocities.com/dbeurive/commun/bison.htm
http://www.ibm.com/developerworks/linux/library/l-lexyac.html
http://www.ibm.com/developerworks/linux/library/l-lexyac2.html
http://www.seebs.net/ops/ibm/email/