I'm learning how to use operations and chains.

I used this nuxeo answer post as a reference: http://answers.nuxeo.com/questions/3596/filter-in-event-handler

I tried to implement a simple Filter like this

<operation id="Document.Filter" >
    <param type="string" name="condition">@{Document.getPropertyValue("dc:title") == "test"}</param>
</operation>

but this is the error I get:

[Near : {… tyValue(“dc:title”) == “test” ….}] [Line: 1, Column: 50]

thank in advance to anyone who could help.