[xwiki-devs] XWiki Development Question

Hello. I've made a class with some properties and some pages as well, following the steps in the documentation. Now I want to access those pages and their properties (which have values) from another page and I can't figure out how. I tried the code from http://platform.xwiki.org/xwiki/bin/view/DevGuide/APIGuide#HAddobjectstoapag... but it doesn't seem to work (it can't find the object or see the values). I also don't quite grasp the difference between space, page, document and object.