How do I go about adding a score attribute to a field

[ramdev.wudali]

Hi All:
    I have been using Solr for a few months now. however I have ran into a 
situation where now I need to have additional values (like score)  to a 
multivalued field. 
for example:
   field def : 
   <field name="ClassificationCode" type="text" indexed="true" stored="true" 
required="false" default=" " multiValued="true"/>

For each of the values, there is a corresponding score that I need to keep 
track of. The best way I can think of is, for the score to be an attribute to 
the str tag within the multivalued field 

Is there a way I could do this ?

Thanks for the community's help

Ramdev