--- /dev/null
+<?xml version="1.0"?>
+
+<!ELEMENT style-configuration (style*,apply*)>
+
+<!ELEMENT style (#PCDATA)>
+<!ATTLIST style key CDATA #IMPLIED>
+
+<!ELEMENT apply (style-ref*)>
+<!ATTLIST apply name CDATA #REQUIRED>
+
+<!ELEMENT style-ref EMPTY>
+<!ATTLIST style-ref key CDATA #REQUIRED>
+