[xml] rewrite schema directed serialization/deserialization methods

The new implementations of lasso_node_impl_init_from_xml now validate
namespace of all child nodes befores parsing. It stops on any error. For
node which implement their own parsing of an attribute or a node, it
must declare an XmlSnippet with an offset field set to 0. The 0 value is
invalid for public GObject structure (it's the place of the GObject
machinery like the reference count). The 0 offset can be used for
XmlSnippet in a private structure, so never set the offset to 0 with the
flag SNIPPET_PRIVATE, for a field which is parsed by you get_xmlNode
virtual method.

Other ameliorations in this commit is the possibility to set attributes
with namespace when using the flags SNIPPET_ATTRIBUTE|SNIPPET_ANY. The
syntax for an attribute is inspired by the element tree API from Python:

	{namespace}attribute_name

an example:

	{http://www.w3.org/2001/XMLSchema-instance}type

for the classic xsi:type attribute.

1 files changed, 1 insertions, 0 deletions

diff --git a/lasso/id-ff/name_registration.c b/lasso/id-ff/name_registration.c
index 0badf76d..7d554902 100644
--- a/lasso/id-ff/name_registration.c
+++ b/lasso/id-ff/name_registration.c
@@ -645,6 +645,7 @@ lasso_name_registration_validate_request(LassoNameRegistration *name_registratio
 static struct XmlSnippet schema_snippets[] = {
 	{ "OldNameIdentifier", SNIPPET_NODE_IN_CHILD,
 		G_STRUCT_OFFSET(LassoNameRegistration, oldNameIdentifier), NULL, NULL, NULL},
+	{ "NameRegistrationDumpVersion", SNIPPET_ATTRIBUTE, 0, NULL, NULL, NULL},
 	{NULL, 0, 0, NULL, NULL, NULL}
 };