Nothing
is.Catalog <- function(x, ignore.class = FALSE) {
if ( any(unlist(lapply(x$catalog, .canbeCatalog)) == FALSE) == TRUE ) { return(FALSE) }
if ( length(x$catalog) != length(x$data) ) { return(FALSE) }
if ( ( ! ignore.class ) & ( class(x) != 'Catalog' ) ) { return(FALSE) }
return(TRUE)
}
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