The 'typeprefix' support is non-compliant.

TAO_IDL will accept typeprefix for a scoped name *before* the scoped name is declared, i.e.:

typeprefix Components "org.omg";

module Components
{
  ...
};

The spec however (formal/2008-01-04) clearly states on page 78 (par. 7.15.2) that:

"It must denote a previously-declared name of one of the following IDL constructs:"

Therefor the above construct should be illegal and should be declared as:

module Components
{
  typeprefix Components "org.omg";

  ...
};

or

module Components
{
  ...
};
 Components "org.omg";

CIAO currently hosts a number of IDL files with the illegal form which cause errors when compiled with compliant IDL compilers.