Changelog for xml-extractors-0.4.0.3

0.4.0.0

Added several functions to the Extractors module:
- eitherMessageOrValue from the ShowErr module and some others.
- Both conversion functions from Extra.
This means less imports in many cases.
Some changes were made to the Err datatype:
- ErrExpect was renamed to ErrExpectContent.
- ErrAttr was renamed to ErrExpectAttrib and used for signalling a missing attribute.
- ErrAttribValue was added to cater for erroneous attribute values.
- Some field names have been given more descriptive names.
The conversion/validation function given to attribAs does no longer need to return an Err value for errors, but only a string description of the expected value format.

0.3.0.0