$('<ul><li><span class="library" /></li></ul>')
    .items([
        {library:'Prototype'},
        {library:'jQuery'},
        {library:'Dojo'},
        {library:'MooTools'}
    ])
    .chain();

Chain.js isn’t just bind data automatically to your HTML, but it also maintains and manages your data/items.

var data = {first:'Stephen', last:'Hawking'};
 
// Add one item
$('#persons').items('add', data);
 
// Remove item
$('#persons').items('remove', data);