clarification on reading order correspondence

PRImA-Research-Lab · May 6, 2020 · 654ce6f · 654ce6f
1 parent 9988a70
commit 654ce6f
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/pagecontent/schema/pagecontent.xsd b/pagecontent/schema/pagecontent.xsd
@@ -1328,6 +1328,9 @@
 			they have to be referenced by an UnorderedGroup.
 			Groups may contain further groups, just as regions may
 			contain further regions.
+			Regions may be referenced only once by any ReadingOrder
+			element. (That is, the @regionRef define an injective
+			mapping from the ReadingOrder tree to the Region tree.)
 			</documentation>
 		</annotation>
 		<choice minOccurs="1" maxOccurs="1">