<?xml version="1.0"?>
<doc  xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'
    xsi:noNamespaceSchemaLocation='reC48.xsd' >

<!-- 
base='string', pattern='((ab)(ac){0,2})?', value='abacabac', type='invalid', RULE='2,3,4,5,6,7,8'
-->

     <elem>abacabac</elem>

 </doc>