_:nf02e4abd8b834d25ae10855af887f727xb2
<http://schema.org/valueRequired>
"true"^^<http://www.w3.org/2001/XMLSchema#boolean>
<https://ijdvl.com/view-pdf/?article=48e74ad9d3947c71459a283e8fc57402zeEoHHRxZ05JSg==>