This helps users to retrieve only the information relevant to them. Collections also aid in organizing access permissions. It is possible to declare access rights for a certain part of the collection hierarchy, e.g. designating that only a certain group or user is allowed to view or modify it. However, there are some differences between collections and clusters. One main difference is that by default collections display a list of links to the objects in them when they are accessed, while clusters display some or all of the actual documents contained in them.
Clusters have certain abilities to display documents according to user preferences.
Language clusters implement Hyperwave's multilinguality, i.e. its ability to display the appropriate document according to the language the user prefers, if a document in that language is available. To achieve this effect, first a cluster must be created and then two or more documents must be inserted into it, each one a version of the same document in a different language. These documents must then be made language-dependent . To make an object language-dependent, you simply have to give it exactly one title in the appropriate language. Users can set their language preference using any browser and when they access the cluster, the preferred version of the document is automatically retrieved if it is available.