diff --git a/XMLCONF b/XMLCONF
index 6511672..ff28854 100644
--- a/XMLCONF
+++ b/XMLCONF
@@ -974,21 +974,11 @@ ibm/not-wf/P09/ibm09n01.xml [not-wf?] not-wf
 ibm/not-wf/P09/ibm09n02.xml [not-wf?] not-wf
 ibm/not-wf/P09/ibm09n03.xml [not-wf?] not-wf
 ibm/not-wf/P09/ibm09n04.xml [not-wf?] not-wf
-ibm/not-wf/P10/ibm10n01.xml [not-wf?] FAILED:
-  well-formedness violation not detected
-[
-    Tests an attribute with an invalid value. The value of the attribute "first"
-    contains the character "less than".
-  ]
+ibm/not-wf/P10/ibm10n01.xml [not-wf?] not-wf
 ibm/not-wf/P10/ibm10n02.xml [not-wf?] not-wf
 ibm/not-wf/P10/ibm10n03.xml [not-wf?] not-wf
 ibm/not-wf/P10/ibm10n04.xml [not-wf?] not-wf
-ibm/not-wf/P10/ibm10n05.xml [not-wf?] FAILED:
-  well-formedness violation not detected
-[
-    Tests an attribute with an invalid value. The value of the attribute "first"
-    contains the character "less than".
-  ]
+ibm/not-wf/P10/ibm10n05.xml [not-wf?] not-wf
 ibm/not-wf/P10/ibm10n06.xml [not-wf?] not-wf
 ibm/not-wf/P10/ibm10n07.xml [not-wf?] not-wf
 ibm/not-wf/P10/ibm10n08.xml [not-wf?] not-wf
@@ -1833,4 +1823,4 @@ ibm/valid/P86/ibm86v01.xml [not validating:] input [validating:] input
 ibm/valid/P87/ibm87v01.xml [not validating:] input [validating:] input
 ibm/valid/P88/ibm88v01.xml [not validating:] input [validating:] input
 ibm/valid/P89/ibm89v01.xml [not validating:] input [validating:] input
-9/1786 tests failed; 376 tests were skipped
\ No newline at end of file
+7/1786 tests failed; 376 tests were skipped
\ No newline at end of file
diff --git a/xml/xml-parse.lisp b/xml/xml-parse.lisp
index 373d2f2..e4a506c 100644
--- a/xml/xml-parse.lisp
+++ b/xml/xml-parse.lisp
@@ -1368,9 +1368,7 @@
                       (rune= c #/U+000A)
                       (rune= c #/U+000D))))
       (consume-rune input))
-    (cons name (read-att-value-2 input))
-    ;;(cons name (read-att-value zinput input :ATT t))
-    ))
+    (cons name (read-att-value-2 input))))
 
 (defun canon-not-cdata-attval (value)
   ;; | If the declared value is not CDATA, then the XML processor must
@@ -3283,6 +3281,8 @@
                  (error "EOF"))
                 ((rune= c delim)
                  (return))
+                ((rune= c #/<)
+		 (wf-error "'<' not allowed in attribute values"))
                 ((rune= #/& c)
                  (multiple-value-bind (kind sem) (read-entity-ref input)
                    (ecase kind