Any elements allow you to attach any type of object to a choice or a sequence group particle.
The following illustration shows an Any in a diagram:
In an XSD file, Any is declared with the <any> tag:
In a DTD file, Any is declared within an <!ELEMENT> tag with the keyword "ANY":
In an XDR file, Any is declared through of an <ElementType> tag (resources in the example) with its model attribute set to "open". Although it is displayed in a diagram, Any is not considered as an object in an XDR file: