# Shared object properties

Feed, subscription list, and opportunity objects share several common properties. Although the content may come from different elements in the source document, the information is stored in consistent attributes.

Wherever you see `objects[i]` in these documents you can substitute `feeds[i]`, `lists[i]`, or `opportunities[i]`.

- objects[i].categories
- objects[i].tags
- objects[i].title
- objects[i].url