Cami, The expression: MetacelloPlatform current defaultPlatformAttributes will list the platform attributes at the system level (default). The expression: ConfigurationOfXXX project platformAttributes will list the set of attributes defined for a particular configuration (presumably a superset of the default set). If you look in MetacelloPharoPlatform>>defaultPlatformAttributes, you'll see the following: defaultPlatformAttributes | attributes versionString | ((Smalltalk respondsTo: #image) and: [ Smalltalk image respondsTo: #metacelloPlatformAttributes ]) ifTrue: [ ^ Smalltalk image metacelloPlatformAttributes ]. ..... The method #metacelloPlatformAttributes let's you define exactly the set of attributes that you want supported for pharo platforms ... Hope this helps, Dale ----- Original Message ----- | From: "Camillo Bruni" <camillobruni@gmail.com> | To: pharo-dev@lists.pharo.org | Sent: Monday, June 17, 2013 6:41:00 AM | Subject: [Pharo-dev] metacello conditional loading | | - where do I find a list of the magic tags I can use for conditional | loading? | - is `spec for: #'pharo3.x' version: '3.0'` already supported? | | thanks | |