<?xml version="1.0" encoding="UTF-8"?>

<!ELEMENT groups (group+)>

<!ELEMENT group (attributes?, group*)>

<!ENTITY % types "string | numeric | date | time | datetime | long | bool">

<!ATTLIST group 
	name CDATA #REQUIRED
	type (%types;) #IMPLIED>
	
<!ELEMENT attributes (attribute+)>	

<!ELEMENT attribute EMPTY>

<!ATTLIST attribute 
	value CDATA #REQUIRED>