sgml dtd to w3 schema conversion

hello,

i have a little bit of a problem. i'm trying to
convert a sgml dtd to a schema. here's the
declaration:

<!ENTITY  % group1    "(element1 | element2 | element3
| element4 | element5 | element6 | element7)+" >

i was hoping to make this into a group in the schema
because it it will be used in many place, but having
an unbounded choice in a group isn't allowed. 

any suggestions?

thanks,

-scott

"Do you realize...that happiness makes you cry?"
        -The Flaming Lips

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