The subject can contain the symbol "%", indicates "reference to the attribute of"

          "claws of cats are retractile"

          the feature "retractile" is referring to the "claws", but not to every "claw" only to the "claws of cats". In this case the subject would be "cat%claw"

          the symbol can appears more than once, for example to represent "the nail of the claw of the cats", this case would be represented as "cat%claw%nail"

          The subject can also contain the symbol "_" that means specialization reference, in other words, multiple word concept

          "stock exchange" → stock_exchange

          Code to indicate the relation between the subject and the object

          ISA= parent

          IS = feature

          HAVE = attribute

          CAN = skill

          CANBE = affected action

          used only for questions:

          ISAIS = "is a cat an animal?" animal can be both noun and adjective; then it's hard to decide if it's questioning about cat;

                        is an animal (ISA/parent relation) or if cat has animal as feature (IS / feature relation)

          Can be a noun, adjective or action verb depending of the code type (ILCODE).

          feature if IS, verb if CAN or CANBE, noun otherwise.

          As numbers referring to an object (numbered attributes): animals have from two to four, eight and twelve legs → animal HAVE leg 2-4/8/12 10 4

          (slash separated list of number or range, the values must be lower than a million)

          Also to store the interactions, the format of extra field in the case of skills is the following: lexRef{*tend}{&source}

                   Note that an ILC with skill as ilcode ONLY ONE interaction is allowed.

                   Remind {} means optionallity; if the tendency or source is not reported then value = 1 is assumed.

          Put only 1 slash is interpreted as null value (the relation has no extra): the dog is not a robot → dog ISA robot / -1

          Examples:

                   persons can write books → person CAN write book*2&2 1 1 (interaction with explicit tendency and source)

                   spiders jump over the door → spider CAN jump door (only interactions wihtout explicit tendency or source declaration)

                   finger can press key&3 ( interactions wiht only source declaration)

                   spiders sleep → spider can sleep / 1 1 (without interactions)

                   An spider can eat so very quickly an insect, but not a mouse → spider CAN eat insect + spider CAN eat mouse*-1

                                                         (unique declaration, assuming tendency and source)