--- a/RelaxNG/publidoc.rnc	lun. juil. 18 19:10:28 2011 +0200
+++ b/RelaxNG/publidoc.rnc	lun. juil. 18 23:35:32 2011 +0200
@@ -61,6 +61,7 @@
 
 top.head.content =
    (title, subtitle?)?
+ & identifier*
  & language?
  & author*
  & publisher?
@@ -93,11 +94,22 @@
 
 title.content = inlines
 
+# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ identifier ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+identifier = element identifier { identifier.content, identifier.attributes }
+
+identifier.attributes =
+   class.attribute
+class.attribute = attribute class { "uri" | "ean" }
+
+identifier.content =  xsd:anyURI | xsd:NMTOKEN
+
 # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ language ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 language = element language { language.attributes }
 
-language.attributes = lang.attribute
+language.attributes =
+   lang.attribute
 lang.attribute = attribute xml:lang { xsd:language }
 
 # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ author, publisher ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -114,16 +126,12 @@
    lastname,
    role*
 
-role = element role { role.attributes }
-
-role.attributes =
-   role.of.attribute
-role.of.attribute = attribute of { "author" | "illustrator" }
-
 # ~~~~~~ publisher
 publisher = element publisher { publisher.content }
 
-publisher.content = inlines
+publisher.content =
+   label,
+   url?
 
 # ~~~~~~ firstname
 firstname = element firstname { firstname.content }
@@ -135,6 +143,23 @@
 
 lastname.content = inlines
 
+# ~~~~~~ label
+label = element label { label.content }
+
+label.content = inlines
+
+# ~~~~~~ role
+role = element role { role.attributes }
+
+role.attributes =
+   role.of.attribute
+role.of.attribute = attribute of { "author" | "illustrator" }
+
+# ~~~~~~ url
+url = element url { url.content }
+
+url.content = xsd:anyURI
+
 # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ place ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 place = element place { place.content }
@@ -302,11 +327,6 @@
    label,
    block+
 
-# ~~~~~~ label
-label = element label { label.content }
-
-label.content = inlines
-
 # ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ table ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 table = element table { table.content }