columns
attribute of the index
type was xs:NMTOKENS
, therefore not allowing a comma, which is needed when multiple columns need to be specified. (I've checked the XmlDriver code for this)
It should be the same as the `columns` attribute of the `unique-constraints` type, namely `xs:string`.
Doctrine 2 ORM
Doctrine 2 is an object-relational mapper (ORM) for PHP 5.3.0+ that provides transparent persistence for PHP objects. It sits on top of a powerful database abstraction layer (DBAL). One of its key features is the option to write database queries in a proprietary object oriented SQL dialect called Doctrine Query Language (DQL), inspired by Hibernates HQL. This provides developers with a powerful alternative to SQL that maintains flexibility without requiring unnecessary code duplication.
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