Q on representing multiple values for an Attribute

Hi,
 
In my implementation of SMIL document I want to use more than two values for an attribute.
Is this type of implementation supported by SMIL at present?
 
Assuming that SMIL is not supporting this kind of implementation,
I am using following approach.
 
Example:
       <text src="txt00.txt ; txt01.txt" region="Text"/>
 
In the above example. src has two values separated by semicolon.
txt00.txt
txt01.txt
Can I use an implementation like this?
 
Thanks
Seema
 
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