Propel ORM is an Object-Relational Mapping (ORM) framework for PHP5. It allows developers you to access a database using a set of objects, providing a simple API for storing and retrieving data. Meanwhile, allowing the developer, to work with databases in the same way he works with other scripts and objects in PHP. Various database systems are supported.

Features of Propel ORM:
- Removed tabs.
- Added `-` to the xsd simple type `file` comment.
- "package" is actually a file path, it should be able to contain dashes. Changed the xsd database>package data type to `file` and adapted simple type `file` to allow them to contain dashes. Added a test for it.
- Fixed set descendant class
- Adjusted coding style and fixed a innodb vs. myIsam bug in nested set test resulting out of the new distinction between them.
- Fixed invalid regex for php_class data type.

What's New in This Version:
- Removed tabs.
- Added `-` to the xsd simple type `file` comment.
- "package" is actually a file path, it should be able to contain dashes. Changed the xsd database>package data type to `file` and adapted simple type `file` to allow them to contain dashes. Added a test for it.
- Fixed set descendant class
- Adjusted coding style and fixed a innodb vs. myIsam bug in nested set test resulting out of the new distinction between them.
- Fixed invalid regex for php_class data type.