white space and content m odel

[yamy]

<?xml version="1.0" encoding="iso-8859-1" ?>
<!DOCTYPE techdatatable [
<!ELEMENT aatable (grade+,application+,description+,color+,viscosity+,gapfill+,shearstrength+,torquebreak+,torqueprev+, fixturetime+,temp+,specs*)>
<!ELEMENT grade+ (#CDATA)>

in the above code snip - this produces the message "required white space missing" - no amount of adding or deleting white space makes a difference

if i change grade+ to grade, then the message changes to "content model invalid" - i tried aatable-grade but that didn't help

can anyone steer me in the right direction?
thanks
yamy

 

[tsuji]

><!ELEMENT grade+ (#CDATA)>
[tt]<!ELEMENT grad[highlight]e [/highlight](#[red]P[/red]CDATA)>[/tt]