Anatomy of a Portlet

The bits that go to make up a portlet renderer (which is the bit of a portlet you'll want to customize).

Customizing a portlet is similar to overriding a viewlet, but rather more straightforward. There is a specific ZCML directive for customization.

Directive in ZCML

<plone:portletRenderer />

Attributes in ZCML

layer

a marker interface for your particular theme

portlet

the interface of the portlet you wish to customize

template

location of the template you wish to override

class

your custom class (use this if you don't specify a template) for rendering the portlet