I am trying to do an AND / & condition in my attrs as you can see below.  However the ampersand is causing errors, most likely to it breaking the XML (As a special character).  I have tried escaping it after which it no longer raises and error, but it simply does render the field read only.

<field name="name" string="Product Name" attrs="{'readonly':['|','&',('groupEngineering','!=','YES'),('groupMarketing','!=','YES'),('state','!=','Completed')]}" />

Any thoughts?

Thanks,
Damien