[libgsf] xml: complain over duplicate nodes.

[Morten Welinder <mortenw src gnome org>]

commit 27af8fc806df5294229b0b76cb2fdf19888c2644
Author: Morten Welinder <terra gnome org>
Date:   Tue Mar 31 19:41:01 2015 -0400

    xml: complain over duplicate nodes.

 gsf/gsf-libxml.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/gsf/gsf-libxml.c b/gsf/gsf-libxml.c
index a17cd93..7e589bf 100644
--- a/gsf/gsf-libxml.c
+++ b/gsf/gsf-libxml.c
@@ -1205,6 +1205,9 @@ gsf_xml_in_doc_add_nodes (GsfXMLInDoc *doc,
                                        e_node->id);
                                continue;
                        }
+
+                       if (strcmp (e_node->parent_id, node->pub.parent_id) == 0)
+                               g_warning ("Duplicate node %s (under %s)", e_node->id, e_node->parent_id);
                } else {
                        if (e_node->has_content == GSF_XML_2ND) {
                                g_warning ("ID '%s' is declared 2nd, but is missing.",