Added 'abstract' reserved keyword to attribues
Added 'abstract' reserved keyword to attribues

midgardproject/midgard-core,midgardproject/midgard-core,midgardproject/midgard-core,piotras/midgard-core,midgardproject/midgard-core,piotras/midgard-core,piotras/midgard-core,piotras/midgard-core