code: public static Optional<Resource> ldpInsertedContentProperty(final Node node) {
          return getContainingNode(node).filter(uncheck(parent -> parent.hasProperty(LDP_MEMBER_RESOURCE) &&
                  parent.isNodeType(LDP_INDIRECT_CONTAINER) && parent.hasProperty(LDP_INSERTED_CONTENT_RELATION)))
              .map(UncheckedFunction.uncheck(parent ->
                          createResource(parent.getProperty(LDP_INSERTED_CONTENT_RELATION).getString())));
      }
docs: Given a JCR Node, fetch the parent's ldp:insertedContentRelation value, if
  one exists.
  
  @param node the JCR Node
  @return the ldp:insertedContentRelation Resource, if one exists.