Sure, try this test file with elements out of order:
<?xml version="1.0"?>
<!DOCTYPE doc [
<!ELEMENT doc (a, b*, c*)>
<!ELEMENT a (#PCDATA)>
<!ELEMENT b (#PCDATA)>
<!ELEMENT c (#PCDATA)>
]>
<doc><a>Title element</a><c>indexterm</c><b>regular content</b></doc>
Without --nowarning I get the "expecting" clause:
nowarn.xml:8: element doc: validity error : Element doc content does not
follow
the DTD, expecting (a , b* , c*), got (a c b)
<doc><a>Title element</a><c>indexterm</c><b>regular content</b></doc>
^
With --nowarning I don't get the "expecting" clause:
nowarn.xml:8: element doc: validity error : Element doc content does not
follow
the DTD
<doc><a>Title element</a><c>indexterm</c><b>regular content</b></doc>