Which constructs are the comments about?
<!-- Indigenous person's hunting permit -->
<!ELEMENT hperm (thone, kallow, spec, date)>
<!ELEMENT thone (#PCDATA)> <!-- person's name -->
<!ELEMENT kallow (#PCDATA)> <!-- kill allowance -->
<!ELEMENT spec (#PCDATA)> <!-- species -->
<!ELEMENT date (#PCDATA)> <!-- expiration date -->
<!-- lexical model: YYYY MM DD -->
<thone>UDLINGBLON</thone>