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Methods like .asCD() replace .value.oclAsType(CD) ; and .oclIfUndefined()  replace replaces extra lines of code. This . The .oclIfUndefined() is an example of null coalescing. and is particularly useful when using the GELLO within archetypes. 

For example this:

Let tumourSite: CDString= If template.Examples.Tumour_site
                                     .value.oclAsType(CD).oclIsDefined() 
                                        then  
                             template.Examples.Tumour_site
                                     .value.oclAsType(CD).displayName.value
                     else null'' endif 

can be rewritten as this:

Let tumourSite: CDString= template.Examples.Tumour_site.asCD().displayName.value.oclIfUndefined(null'')

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Most types have these methods now, ie asBoolean(), asString() ..