+int OS_ApplyVariables(OS_XML *_lxml) __attribute__((nonnull));
+
+/* Error from writer */
+#define XMLW_ERROR 006
+#define XMLW_NOIN 007
+#define XMLW_NOOUT 010
+
+/* OS_WriteXML
+ * Write an XML file, based on the input and values to change.
+ */
+int OS_WriteXML(const char *infile, const char *outfile, const char **nodes,
+ const char *oldval, const char *newval) __attribute__((nonnull(1,2,3,5)));