xml FEATURE XML attribute parsing function
diff --git a/src/common.h b/src/common.h
index 4f0157b..a15fb72 100644
--- a/src/common.h
+++ b/src/common.h
@@ -113,6 +113,11 @@
#define LY_CHECK_ARG_RET3(CTX, ARG1, ARG2, ARG3, RETVAL) LY_CHECK_ARG_RET2(CTX, ARG1, ARG2, RETVAL);LY_CHECK_ARG_RET1(CTX, ARG3, RETVAL)
#define LY_CHECK_ARG_RET(CTX, ...) GETMACRO4(__VA_ARGS__, LY_CHECK_ARG_RET3, LY_CHECK_ARG_RET2, LY_CHECK_ARG_RET1)(CTX, __VA_ARGS__)
+/* count sequence size for LY_VCODE_INCHILDSTMT validation error code */
+size_t LY_VCODE_INSTREXP_len(const char *str);
+/* default maximum characters to print in LY_VCODE_INCHILDSTMT */
+#define LY_VCODE_INSTREXP_MAXLEN 20
+
#define LY_VCODE_INCHAR LYVE_SYNTAX, "Invalid character 0x%x."
#define LY_VCODE_INSTREXP LYVE_SYNTAX, "Invalid character sequence \"%.*s\", expected %s."
#define LY_VCODE_EOF LYVE_SYNTAX, "Unexpected end-of-file."