Music constituents published after 1900

post1900Music.xql

declare namespace tei = "http://www.tei-c.org/ns/1.0";

declare function local:w3cdtf-to-xsdate($d as xs:string) as xs:date
{
  let $dstring :=
  if ($d castable as xs:gYear) then $d || "-01-01"
  else if ($d castable as xs:gYearMonth) then $d || "-01"
  else if ($d castable as xs:date) then $d
  else error($d, "not valid w3cdtf")
  return xs:date($dstring)
};

let $issuesOfInterest := collection('/db/bmtn-data/transcriptions')//tei:date[./@when > "1900-01-01"]/ancestor::tei:TEI

let $AllMusicSections := $issuesOfInterest//tei:classCode[.='Music']/ancestor::tei:relatedItem[@type='constituent']

return $AllMusicSections