#1332 no error when using invalid preprocessor directives

[ljessen]

Version: 3.0.4429.0
The following code does not produce an error:

<wix xmlns="http://schemas.microsoft.com/wix/2006/wi">

</wix>

One would expect an: "invalid preprocessing directive" error.

[Rob Mensching]

Preprocessor instructions don't get namespaces so it is not possible to differentiate "extended preprocessor instructions" vs. "invalid data". So the preprocessor just chooses to ignore unknown preprocessor instructions assuming they part of some custom system.