Added documentation for attributes and attribute values

diff --git a/docbook/relaxng/docbook/src/index.rnc b/docbook/relaxng/docbook/src/index.rnc
index 82a25b2d323d754c294750a40a553929aa8df4f9..1994242ed1946f109753ea886704a83a1a7c15ff 100644 (file)
--- a/docbook/relaxng/docbook/src/index.rnc
+++ b/docbook/relaxng/docbook/src/index.rnc
@@ -44,12 +44,55 @@ db.info.elements |= db.itermset
 
 # ======================================================================
 
-db.significance.attribute = attribute significance { "normal" | "preferred" }
-db.zone.attribute         = attribute zone { xsd:IDREFS }
-db.pagenum.attribute      = attribute pagenum { text }
-db.scope.attribute        = attribute scope { "all" | "global" | "local" }
-db.sortas.attribute       = attribute sortas { text }
-db.type.attribute         = attribute type { text }
+db.significance.enumeration =
+   ## Normal
+   "normal"
+ | ## Preferred
+   "preferred"
+
+db.significance.attribute =
+      [
+         db:refpurpose [ "Specifies the significance of the term" ]
+      ]
+   attribute significance { db.significance.enumeration }
+
+db.zone.attribute =
+      [
+         db:refpurpose [ "Specifies the IDs of the elements to which this term applies" ]
+      ]
+   attribute zone { xsd:IDREFS }
+
+db.indexterm.pagenum.attribute =
+      [
+         db:refpurpose [ "Indicates the page on which this index term occurs in some version of the printed document" ]
+      ]
+   attribute pagenum { text }
+
+db.scope.enumeration =
+   ## All indexes
+   "all"
+ | ## The global index (as for a combined index of a set of box)
+   "global"
+ | ## The local index (the index for this document only)
+   "local"
+
+db.scope.attribute =
+      [
+         db:refpurpose [ "Specifies the scope of the index term" ]
+      ]
+   attribute scope { db.scope.enumeration }
+
+db.sortas.attribute =
+      [
+         db:refpurpose [ "Specifies the string by which the term is to be sorted; if unspecified, the term content is used" ]
+      ]
+   attribute sortas { text }
+
+db.index.type.attribute =
+      [
+         db:refpurpose [ "Specifies the target index for this term" ]
+      ]
+   attribute type { text }
 
 # ======================================================================
 
@@ -93,7 +136,15 @@ db.indexterm.contentmodel =
 div {
 
    db.indexterm.singular.role.attribute = attribute role { text }
-   db.indexterm.singular.class.attribute = attribute class { "singular" }
+
+   db.indexterm.singular.class.attribute =
+      [
+         db:refpurpose [ "Identifies the class of index term" ]
+      ]
+      attribute class {
+         ## A singular index term
+         "singular"
+      }
 
    db.indexterm.singular.attlist =
       db.indexterm.singular.role.attribute?
@@ -101,9 +152,9 @@ div {
     & db.common.linking.attributes
     & db.significance.attribute?
     & db.zone.attribute?
-    & db.pagenum.attribute?
+    & db.indexterm.pagenum.attribute?
     & db.scope.attribute?
-    & db.type.attribute?
+    & db.index.type.attribute?
     & db.indexterm.singular.class.attribute?
 
    db.indexterm.singular =
@@ -122,7 +173,15 @@ div {
 div {
 
    db.indexterm.startofrange.role.attribute = attribute role { text }
-   db.indexterm.startofrange.class.attribute = attribute class { "startofrange" }
+
+   db.indexterm.startofrange.class.attribute =
+      [
+         db:refpurpose [ "Identifies the class of index term" ]
+      ]
+      attribute class {
+         ## The start of a range
+         "startofrange"
+      }
 
    db.indexterm.startofrange.attlist =
       db.indexterm.startofrange.role.attribute?
@@ -130,9 +189,9 @@ div {
     & db.common.linking.attributes
     & db.significance.attribute?
     & db.zone.attribute?
-    & db.pagenum.attribute?
+    & db.indexterm.pagenum.attribute?
     & db.scope.attribute?
-    & db.type.attribute?
+    & db.index.type.attribute?
     & db.indexterm.startofrange.class.attribute
 
    db.indexterm.startofrange =
@@ -151,8 +210,21 @@ div {
 div {
 
    db.indexterm.endofrange.role.attribute = attribute role { text }
-   db.indexterm.endofrange.class.attribute = attribute class { "endofrange" }
-   db.indexterm.endofrange.startref.attribute = attribute startref { xsd:IDREF }
+
+   db.indexterm.endofrange.class.attribute =
+      [
+         db:refpurpose [ "Identifies the class of index term" ]
+      ]
+      attribute class {
+         ## The end of a range
+         "endofrange"
+      }
+
+   db.indexterm.endofrange.startref.attribute =
+      [
+         db:refpurpose [ "Points to the start of the range" ]
+      ]
+      attribute startref { xsd:IDREF }
 
    db.indexterm.endofrange.attlist =
       db.indexterm.endofrange.role.attribute?
@@ -312,6 +384,7 @@ div {
     & db.common.linking.attributes
     & db.label.attribute?
     & db.index.status.attribute?
+    & db.index.type.attribute?
 
    db.index.info = db._info
 
@@ -345,6 +418,7 @@ div {
     & db.common.linking.attributes
     & db.label.attribute?
     & db.setindex.status.attribute?
+    & db.index.type.attribute?
 
    db.setindex.info = db._info