[gxml/newattr] Attr.vala: parent_node, previous_sibling, and next_sibling are supposed to be NULL for Attr accordin

[Richard Hans Schwarting <rschwart src gnome org>]

commit e3efe3676b4c2df517212cfac413ed2a853224a5
Author: Richard Schwarting <aquarichy gmail com>
Date:   Wed Oct 23 02:55:32 2013 -0400

    Attr.vala: parent_node, previous_sibling, and next_sibling are supposed to be NULL for Attr according to 
W3C

 gxml/Attr.vala |   51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 51 insertions(+), 0 deletions(-)
---
diff --git a/gxml/Attr.vala b/gxml/Attr.vala
index 286e9c7..fe64883 100644
--- a/gxml/Attr.vala
+++ b/gxml/Attr.vala
@@ -105,6 +105,57 @@ namespace GXml {
 
                /**
                 * { inheritDoc}
+                *
+                * Note: In libxml2, xmlAttrs have parent nodes, which are the Elements that
+                * contain them.  In the W3C DOM, they specifically don't.
+                *
+                * URL: [[http://www.w3.org/2003/01/dom2-javadoc/org/w3c/dom/Attr.html]]
+                */
+               /* TODO: figure out whether the W3C DOM thinks that the same Attr could
+                * belong to multiple Elements.  As we have it implemented, each Attr
+                * can belong to 0 or 1 Elements only.
+                */
+               public override Node? parent_node {
+                       get {
+                               return null;
+                       }
+                       internal set {
+                       }
+               }
+               /**
+                * { inheritDoc}
+                *
+                * Note: In libxml2, xmlAttrs have siblings, which are other Attrs contained
+                * by the same Element.  In the W3C DOM, they specifically don't.
+                *
+                * URL: [[http://www.w3.org/2003/01/dom2-javadoc/org/w3c/dom/Attr.html]]
+                */
+               public override Node? previous_sibling {
+                       get {
+                               return null;
+                       }
+                       internal set {
+                       }
+               }
+               /**
+                * { inheritDoc}
+                *
+                * Note: In libxml2, xmlAttrs have siblings, which are other Attrs contained
+                * by the same Element.  In the W3C DOM, they specifically don't.
+                *
+                * URL: [[http://www.w3.org/2003/01/dom2-javadoc/org/w3c/dom/Attr.html]]
+                */
+               public override Node? next_sibling {
+                       get {
+                               return null;
+                       }
+                       internal set {
+                       }
+               }
+
+
+               /**
+                * { inheritDoc}
                 */
                public override NodeList? child_nodes {
                        owned get {