Implement a default strategy that includes selected mgnl properties (tags mostly); this strategy should be swappable by configuration.

Other policies could be implemented to white-list specific properties, or include more jcr/mgnl-prefixed ones.

few examples:

• keeping mgnl: props but not jcr: ones
• specifying mgnl sys props to include by mixins
• what to do for other domain-ish content (mgnl:template or mgnl:type for blocks)
• give flexibility via query-params?

we could/would probably complement that with separate @nodeTypes and @id special properties.