... and the rest is in the Page

One of the important things in the context is the Page object

this.language = this.language || cody.Application.kDefaultLanguage;

this.title = this.title || item.name || cody.Item.kDefaultName;
this.created = this.created || new Date();
this.updated = this.updated || new Date();
this.link = this.link || "";
this.keywords = this.keywords || "";
this.description = this.description || "";
this.active = this.active || "Y";
this.content =  this.content || []; // all content block from the CMS
this.language =  (en, nl, fr, cz, ...)
this.itemId = (id nr)

Take a look at the file models/page.js