diff --git a/o.js b/o.js
index 9cb94d5..d93893c 100644
--- a/o.js
+++ b/o.js
@@ -540,6 +540,10 @@ o.PatternType = o_PatternType;
 var o_definedType = new o_NotType( o_undefinedType );
 o.definedType = o_definedType;
 
+// o.identifierType
+var o_identifierType = new o_PatternType(/^[A-Za-z_$][A-Za-z_$0-9]*$/);
+o.identifierType = o_identifierType;
+
 // o.integerType
 var o_integerType = o_numberType.subtype( function (val) {
     return (Math.floor(val) === val + 0) ? true : false;
@@ -569,28 +573,28 @@ var o_positiveIntType = new o_AllType([ o_integerType, o_positiveType ]);
 o.positiveIntType = o_positiveIntType;
 
 // o.Attribute
-var booleanOrNonEmptyStringType = new o_AnyType([
+var booleanOrIdentifierType = new o_AnyType([
     o_booleanType,
-    o_nonEmptyStringType
+    o_identifierType
 ]);
 
 var attrAttrs = {
     key: {
-        type: o_nonEmptyStringType,
+        type: o_identifierType,
         required: true
     },
     argKey: {
-        type: new o_AnyType([ o_nonEmptyStringType, o_nullType ]),
+        type: new o_AnyType([ o_identifierType, o_nullType ]),
         devoid: function () { return this.key(); }
     },
     valueKey: {
-        type: o_nonEmptyStringType,
+        type: o_identifierType,
         devoid: function () { return '_' + this.key(); }
     },
 
     devoid: { type: o_definedType },
     builder: {
-        type: booleanOrNonEmptyStringType,
+        type: booleanOrIdentifierType,
         devoid: false,
         filter: function (val) { if (val === true) val = 'build' + o_ucFirst( this.key() ); return val; }
     },
@@ -608,26 +612,26 @@ var attrAttrs = {
     chain: { type: o_booleanType, devoid: false },
 
     reader: {
-        type: booleanOrNonEmptyStringType,
+        type: booleanOrIdentifierType,
         devoid: true,
         filter: function (val) { if (val === true) val = this.key(); return val; }
     },
     writer: {
-        type: booleanOrNonEmptyStringType,
+        type: booleanOrIdentifierType,
         devoid: false,
         filter: function (val) { if (val === true) val = this.key(); return val; }
     },
     predicate: {
-        type: booleanOrNonEmptyStringType,
+        type: booleanOrIdentifierType,
         devoid: false,
         filter: function (val) { if (val === true) val = 'has' + o_ucFirst( this.key() ); return val; }
     },
     clearer: {
-        type: booleanOrNonEmptyStringType,
+        type: booleanOrIdentifierType,
         devoid: false,
         filter: function (val) { if (val === true) val = 'clear' + o_ucFirst( this.key() ); return val; }
     },
-    proxies: { type: new o_ObjectOfType( o_nonEmptyStringType ) }
+    proxies: { type: new o_ObjectOfType( o_identifierType ) }
 };
 
 var attrWriters = {};
diff --git a/o.min.js b/o.min.js
index 320268f..4a4acde 100644
--- a/o.min.js
+++ b/o.min.js
@@ -1,2 +1,2 @@
 // o.js : DEVELOPMENT VERSION : http://o-js.com : MIT License
-(function(){var a=this,b=a.o,c={};a.o=c,a.oJS=c,c.noConflict=function(){return a.o=b,c};var d=function(a,b){return function(){var c=a.apply(this,arguments);return b.call(this),c}};c.after=d;var e=function(a,b){return function(){var c=this,d=Array.prototype.slice.call(arguments),e=function(){return a.apply(c,arguments)};return d.unshift(e),b.apply(c,d)}};c.around=e;var f=function(a,b){return function(){return b.call(this),a.apply(this,arguments)}};c.before=f;var g=function(a){return function(){delete this[a]}};c.clearer=g;var h=function(a){return Object.getPrototypeOf?Object.getPrototypeOf(a):Object.__proto__};c.getPrototypeOf=h;var i=function(a,b){return Object.prototype.hasOwnProperty.call(a,b)};c.has=i;var j=function(a,b,c){var d,e=i(a,b),f=a[b];try{d=c()}finally{e?a[b]=f:delete a[b]}return d};c.local=j;var k=function(){for(var a=Array.prototype.slice.call(arguments),b=a.shift();a.length;){var c=a.shift();for(var d in c)i(c,d)&&(b[d]=c[d])}return b};c.merge=k;var l=function(a){return function(){return i(this,a)&&void 0!==this[a]}};c.predicate=l;var m=function(a,b){return function(){return this[a][b].apply(this[a],arguments)}};c.proxy=m;var n=function(a){return a.charAt(0).toUpperCase()+a.slice(1)};c.ucFirst=n;var o=function(a,b){return b=b||{},b.augments&&(b.type=b.type||"object"),function(c){if(b.filter&&(c=b.filter.call(this,c)),b.type)if("string"==typeof b.type||b.type instanceof String){if(typeof c!==b.type)throw new Error(c+" failed validation.")}else if(b.type instanceof Function){if(!b.type(c))throw new Error(c+" failed validation.")}else b.type.coerce instanceof Function&&b.type.validate instanceof Function&&(b.coerce?c=b.type.coerce(c):b.type.validate(c));if(b.augments&&!(c instanceof b.augments))throw new Error(c+" failed validation.");var d=this[a];return this[a]=c,b.chain?this:d}};c.writer=o;var p=function(a){var b=Object.create(h(a));return b.constructor=a.constructor,k(b,a),b};c.clone=p;var q=function(a,b){return k(a.prototype,b),a};c.construct=q;var r=function(a,b){return b=b||{},b.writer=b.writer||o(a,b),b.predicate=b.predicate||l(a),function(){if(!b.predicate.call(this)){if(b.required)throw new Error(a+" is required.");if(b.devoid){var c=b.devoid;c instanceof Function&&(c=c.call(this)),b.writer.call(this,c)}else b.builder&&b.writer.call(this,this[b.builder].call(this))}return this[a]}};c.reader=r;var s;s=q(function(a){a=a||{},"function"==typeof a&&(a={validate:a}),a.validate&&(this._validateMethod=a.validate),a.coerce&&(this._coerceMethod=a.coerce),a.parent&&(this._parent=a.parent)},{check:function(a){return this._parent&&!this._parent.check(a)?!1:this._validateMethod?this._validateMethod(a)?!0:!1:!0},validate:function(a){if(!this.check(a))throw new Error(a+" failed validation.")},coerce:function(a){return a=this.coerceOnly(a),this.validate(a),a},coerceOnly:function(a){return this._parent&&(a=this._parent.coerceOnly(a)),this._coerceMethod&&(a=this._coerceMethod(a)),a},subtype:function(a){return"function"==typeof a&&(a={validate:a}),new s(k({parent:this},a))}}),c.Type=s;var t=function(a,b){return b=b||{},b.writer=b.writer||o(a,b),b.reader=b.reader||r(a,b),function(a){return void 0!==a?b.writer.call(this,a):b.reader.call(this)}};c.accessor=t;var u=function(a,b,c){var d=e(a,b);return childProto=Object.create(a.prototype),c&&k(childProto,c),d.prototype=childProto,d};c.augment=u;var v=u(s,function(a,b,c){c=c||{},c.validate=function(a){for(var c=0,d=b.length;d>c;c++)if(!b[c].check(a))return!1;return!0},a(c)});c.AllType=v;var w=u(s,function(a,b,c){c=c||{},c.validate=function(a){for(var c=0,d=b.length;d>c;c++)if(b[c].check(a))return!0;return!1},a(c)});c.AnyType=w;var x=u(s,function(a,b,c){c=c||{},c.validate=function(a){for(var c=0,d=b.length;d>c;c++)if(a===b[c])return!0;return!1},a(c)});c.EnumType=x;var y=u(s,function(a,b,c){c=c||{},c.validate=function(a){return 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z(String)]);c.stringType=N;var O=new z(s);c.typeType=O;var P=new y(void 0);c.undefinedType=P;var Q=u(s,function(a,b,c){c=c||{},c.validate=function(a){if(!D.check(a))return!1;for(var c=0,d=a.length;d>c;c++)if(!b.check(a[c]))return!1;return!0},c.coerce=function(a){if(!this.check(a))return a;for(var c=0,d=a.length;d>c;c++)a[c]=b.coerce(a[c]);return a},a(c)});c.ArrayOfType=Q;var R=u(s,function(a,b,c){c=c||{},c.validate=function(a){if(!J.check(a))return!1;if(D.check(b)){for(var c=0,d=b.length;d>c;c++)if(void 0===a[b[c]])return!1;return!0}if(M.check(b)){for(var e in b){if(void 0===a[e])return!1;if(!b[e].check(a[e]))return!1}return!0}return!1},a(c)});c.DuckType=R;var S=u(s,function(a,b,c){c=c||{},c.validate=function(a){if(!J.check(a))return!1;for(var c in a)if(!b.check(a[c]))return!1;return!0},c.coerce=function(a){if(!this.check(a))return a;for(var c in a)a[c]=b.coerce(a[c]);return a},a(c)});c.ObjectOfType=S;var T=u(s,function(a,b,c){c=c||{},c.validate=function(a){return 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