<?xml version='1.0'?>
<!DOCTYPE component [
<!ELEMENT component (PCDATA|sub)*>
<!ATTLIST component
          attr CDATA #IMPLIED
          attr2 CDATA #IMPLIED
>
<!ELMENT sub EMPTY>

]>
<component attr="val'ue" attr2='val"ue'>
<!-- This is a comment -->
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<?xtal cursor='11'?>
<sub/>
<sub></sub>
</component>