tohtml(structuredtext, {

// [optional] how to resolve internal links
linkResolver: function(doc, isBroken) {

// default resolver:
if (isBroken) return '#broken';

// if target document has a url field -> use it
if (doc.document && doc.document.url) return doc.document.url;

// otherwise fallback to id
return '/' + doc.id;
}

// [optional] how to render fragments (Links, Images....)
serializer: function() {
// default serializer:

// add target='_blank' on external links
if (element.type === 'hyperlink' && element.url && element.url.substring(0, 4) === 'http') {
return '' + content + '';
}

return null;
}
})
;