Attribute hooks do not need to be attached in XML docs. Fixes #9568.

src/attributes.js

@@ -320,21 +320,23 @@ jQuery.extend({
 			notxml = nType !== 1 || !jQuery.isXMLDoc( elem );
 
 		// Normalize the name if needed
-		name = notxml && jQuery.attrFix[ name ] || name;
+		if ( notxml ) {
+			name = jQuery.attrFix[ name ] || name;
 
-		hooks = jQuery.attrHooks[ name ];
+			hooks = jQuery.attrHooks[ name ];
 
-		if ( !hooks ) {
-			// Use boolHook for boolean attributes
-			if ( rboolean.test( name ) ) {
+			if ( !hooks ) {
+				// Use boolHook for boolean attributes
+				if ( rboolean.test( name ) ) {
 
-				hooks = boolHook;
+					hooks = boolHook;
 
-			// Use formHook for forms and if the name contains certain characters
-			} else if ( formHook && name !== "className" &&
-				(jQuery.nodeName( elem, "form" ) || rinvalidChar.test( name )) ) {
+				// Use formHook for forms and if the name contains certain characters
+				} else if ( formHook && name !== "className" &&
+					(jQuery.nodeName( elem, "form" ) || rinvalidChar.test( name )) ) {
 
-				hooks = formHook;
+					hooks = formHook;
+				}
 			}
 		}
 
@@ -465,10 +467,11 @@ jQuery.extend({
 		var ret, hooks,
 			notxml = nType !== 1 || !jQuery.isXMLDoc( elem );
 
-		// Try to normalize/fix the name
-		name = notxml && jQuery.propFix[ name ] || name;
-		
-		hooks = jQuery.propHooks[ name ];
+		if ( notxml ) {
+			// Fix name and attach hooks
+			name = jQuery.propFix[ name ] || name;
+			hooks = jQuery.propHooks[ name ];
+		}
 
 		if ( value !== undefined ) {
 			if ( hooks && "set" in hooks && (ret = hooks.set( elem, value, name )) !== undefined ) {

test/data/dashboard.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <dashboard>
 	<locations class="foo">
-		<location for="bar">
+		<location for="bar" checked="different">
 			<infowindowtab>
 				<tab title="Location"><![CDATA[blabla]]></tab>
 				<tab title="Users"><![CDATA[blublu]]></tab>

test/unit/attributes.js

@@ -132,11 +132,12 @@ test("attr(String)", function() {
 
 if ( !isLocal ) {
 	test("attr(String) in XML Files", function() {
-		expect(2);
+		expect(3);
 		stop();
 		jQuery.get("data/dashboard.xml", function( xml ) {
-			equals( jQuery( "locations", xml ).attr("class"), "foo", "Check class attribute in XML document" );
-			equals( jQuery( "location", xml ).attr("for"), "bar", "Check for attribute in XML document" );
+			equal( jQuery( "locations", xml ).attr("class"), "foo", "Check class attribute in XML document" );
+			equal( jQuery( "location", xml ).attr("for"), "bar", "Check for attribute in XML document" );
+			equal( jQuery( "location", xml ).attr("checked"), "different", "Check that hooks are not attached in XML document" );
 			start();
 		});
 	});