Someone

if (source->priv->name == NULL
	    || strcmp (name, source->priv->name) != 0
	    || source->priv->relative_uri == NULL
	    || relative_uri != NULL
	    || strcmp (relative_uri, source->priv->relative_uri) != 0) {
		g_free (source->priv->name);
		source->priv->name = g_strdup (name);

		g_free (source->priv->relative_uri);
		source->priv->relative_uri = g_strdup (relative_uri);

		changed = TRUE;
	}