How many parameters does assertEquals take?

Hi,
  I am now trying to write a transform for a dom implementation. I
seen in the DTD that the assertEquals :

<!ELEMENT assertEquals (metadata?, (%statement;)*)>

>From the DTD, an assertEquals element can have multiple statements,
but I think it is only rational when there are only two. Could anybody
tell me whether we can assume there are only two statments inside
assertEquals? Thanks.

Regards!

Bo