The current OpenRocket file format is "documented" only as the
reference implementation.  This will hopefully change in the future.


The "version" attribute of the <openrocket> tag describes the file
format version used, while the "creator" attribute MAY describe the
software version used to write the document.

The file format version is increased every time the format is
changed.  The minor number is increased when changes are made that are
mostly backward-compatible, meaning that older software versions
should be able to read the design sans the new features.  The major
number is increased when changes are made that render the design
problematic or impossible to read for older software.  For maximum
compatibility software should save a file in the oldest file format
version that supports all the necessary design features.


The following file format versions exist:


0.9:  Used before the first public release of Openrocket; effectively
      equivalent to 1.0.  Should not be used when writing documents.
      OpenRocket accepts this version when reading files, but other
      software need not.

1.0:  File format version of the first public release (OpenRocket 0.9.0)

1.1:  Introduced with OpenRocket 0.9.4.  Adds support for saving fin
      tabs (<tabheight>, <tablength> and <tabposition> elements) and
      allows attaching subcomponents to a tube coupler (previously
      forbidden).