Allows the type of a compositor to be changed.

All

Make the compositor into an <xs:all> element. This means that the contained entities have to be present into the resulting XML document, but the order that they appear in not important.
Note: An all can not be the child of a <xs:choice> or <xs:sequence>, so this option is sometimes disabled. 

Choice

Make the compositor into an <xs:choice> element. This means that only one of the contained entities can be present into the resulting XML document.

Sequence

Make the compositor into an <xs:sequence> element. This means that the contained entities have to be present into the resulting XML document, and they must appear in the order they are defined in the XSD schema.