Using TaskDef with file gives error

[kontakt@…]

I use a task-def like this:

<taskdef file="./library/Doctrine/Extensions/Phing/Task/InstallSql.php" classname="Doctrine\Extensions\Phing\Task\InstallSql" />

With a Task:

class InstallSql extends AbstractDoctrineTask
{
    protected $taskName = "dc2-install-sql";
//...

It gives me an error:

benny@benny-pc:~/code/php/wsnetbeans/whitewashing$ phing
Buildfile: /home/benny/code/php/wsnetbeans/whitewashing/build.xml
Task  has no class defined.
[PHP Error] include_once("dc2-install-sql";.php): failed to open stream: No such file or directory [line 1017 of /usr/local/php531/lib/php/phing/Phing.php]
[PHP Error] include_once(): Failed opening '"dc2-install-sql";.php' for inclusion (include_path='/usr/local/php531/lib/php/Pearanha/Pearanha/Phing:/home/benny/code/php/wsnetbeans/whitewashing/library/Whitewashing/Phing:.:/usr/local/php531/lib/php') [line 1017 of /usr/local/php531/lib/php/phing/Phing.php]
  [taskdef] Error importing "dc2-install-sql";.php

BUILD FAILED
Error reading project file [wrapped: Error importing "dc2-install-sql";.php]
Total time: 0.0736 seconds

[anonymous]

Either the docs or the code is wrong. TaskDef seems to include a properties file and load tasks from there, the docs say otherwise.

The problem is, namespaced code is not supported and i want to include the file and have the class registered automatically.

[mrook]

When the 'file' attribute is specified, taskdef expects that attribute to point to a file listing task definitions, in the form of "mytask=My.Namespace.MyTask". Both dot-notation and PEAR style naming (My_Namespace_MyTask) are supported.