More efficient method to get metadata values

This message is of important to everyone that is using metadata in their 
own code.

There is a (relatively) new method on the metadata service to get values 
from the system in a vastly more efficient way.

Where you used to get a binding for the object, and then ask the binding
for a metadata value in a particular metadata set, like so:

   binding = self.service_metadata.getMetadata(object)
   value = binding.get('set_id', 'element_id')

we've now implemented a method that can by-pass the binding, and that 
seems to give a nice performance boost:

   value = self.service_metadata.getMetadataValue(
       object, 'set_id', 'element_id')

This should be used everywhere it's possible to do so, at least in the 
public views. Notable exceptions are: If you are doing something more 
than just getting a value from the metadata system, for instance setting 
metadata, you might just as well get the binding.

-- 
- eric casteleijn
http://infrae.com