What is the function of keys in XSL?

What is the function of keys in XSL?

- Keys in XSL are a way to provide the documents with the implicit cross reference structure.

- It provides the documents to be implemented in a structured manner using the functionality and the architecture.

- It provides ID, IDREF and IDREFS kind of attributes in the XML document that allow it to make the cross references explicit.

- XSL provide the XPath id function that allows the support of the cross reference variables.

- It also provides the mechanism to unlock the objects access for a particular use on the website.