Changes in Version 1.1-0

  o The CITATION was incorrect and is fixed now.


Changes in Version 1.1-0

  o All methods returning "formula" or "Formula" objects now preserve the
    environment of the originally supplied object by default.

  o The default and formula methods of as.Formula() methods now also take
    an env argument.


Changes in Version 1.0-1

  o Added a terms = FALSE argument to model.part() method for "Formula"
    objects. This can be leveraged when processing multiple offsets.
    For example for y ~ x + offset(o1) | z + offset(o2). See ?model.part
    for a worked example.


Changes in Version 1.0-0

  o package now published in Journal of Statistical Software,
    see http://www.jstatsoft.org/v34/i01/
    and citation("Formula") within R. 

  o added an all.equal() method for "Formula" objects that produces
    more intelligible output in case the result is not TRUE.

  o fixed an error of the update() method for "Formula" objects
    without LHS.


Changes in Version 0.2-0

  o Major revision (not fully backward compatible) to enable support
    for multiple responses and multiple parts on the right-hand side
    such as
      y1 | y2 ~ x
      y1 + y2 ~ x1 + x2 | z1
      y ~ u1 + u2 | v1 | x1 + x2
    and combinations of these.
        
  o Formula objects now consist of the original formula plus two
    attributes "lhs" and "rhs" that contain the parts of the decomposed
    left- and right-hand side, respectively.

  o Most methods take arguments "lhs" and "rhs" which allow selection
    of the desired parts on the left- and right-hand side respectively,
    e.g., in a model.frame() or model.matrix().
    
  o The previous arguments response = TRUE/FALSE and
    part = "first"/"second"/"both" were not flexible enough anymore
    and have been deprecated. Use the streamlined lhs/rhs arguments
    instead.

  o vignette("Formula", package = "Formula") illustrates usage of
    the tools provided by the package and explains the ideas underlying
    its implementation.


Changes in Version 0.1-3

  o added CITATION file.

  o added a has.intercept function with methods for formula and
    Formula objects.

  o change the default value for model.frame.Formula: "both" for a
    two-part formula and "first" otherwise.


Changes in Version 0.1-2

  o Bug fix: as.Formula() failed for very long formulas.
  

Changes in Version 0.1-1

  o First CRAN release of package "Formula" for extended
    formula processing. This package is still under development
    and the interface might change in future versions.
  
  o Currently, this enables processing of formulas such as
      y ~ x1 + x2 | z1 + z2 + z3
    with two parts on the right hand side.
    
  o Generalization to further formulas are planned (i.e.,
    not implemented yet), e.g.,
      y1 + y2 ~ x1 + x2 + x3
      y ~ x1 + x2 | u1 | v1 + v2 + v3 | ...
    i.e., multiple responses and multi-part formulas.
