Siblings

Siblings are similar to hard links in unix filesystems. There are two or more filesystem headers in different locations of the filesystem. Each of them has it's own file properties (although in opencms there can also be shared properties that are commonly used by all siblings that share the same content).

The content (e.g. a steam of XML data or an image) exists only once and is shared among all siblings. If the content of one is updated through one sibling, then all other siblings that use the same content are also affected.

Whenever two siblings share the same content, they must also have the same file type.