Next

var label = $0 ?? $label ?? "Next >> ";

var pages = [ xml.num(id) foreach var id in wiki.tree(page.parents[0].path)['//@pageid'] ];
var current = list.indexof(pages, page.id);
var next;
if((current >= 0) && (current < #pages - 1)) {
    let next = wiki.getpage(pages[current + 1]).uri;
}
if(next) {
    <a href=(next ? next : '#')> label </a>
} else {
    <span> label </span>
}