How to extend workitem to store additional data consisting of many key/value pairs java api

Valli,
    Well  it would  be constant   in that  we  have a total of  8keys(  and scores). Each  workitem   will store  a max of  4 keys/value  pairs  but those  4 keys  will  be a subset  of the  8.    I hope I am  not confusing  you    but   basically   we need  to create   8keys . The  keys  strings  will remain constant
Each work item  will  store   only 4 keys  and  value  pair
For  now  I am sort of   showing all the 4 keys  and  values(8 fields in all ) for each workitem  and display it in the  default   presentation   and itr looks really clumsy ...
I have something like this
Firstkeyname
Firstscore
SecondKeyname
Secondscore  .....

I want to be able to link   to  it , store it  and programmatically   retrieve  it in a nicer manner  .
Any   ideas?

you can choose to display it in a 

Valli,
 Thanks  for  your response . The  choices are not   exactly clear to  me .   Here are  a few notes.
 The most important factor  is that  I need to be able to programmatically  store  the  keys/value pairs  with the  workitem  and  later  to be  able to retrieve them  programmatically. Each work item  will have  4 of 8 possible keys and each for any work item will have its own hvalue
Concerning your  mentioned options
1. Will  using a different  tab still  keep it attached  to the workitem ? Are you  saying  just add  a new tab/section for the  presentation and simply  have users  tab  over to see the scores? 
Options  2   interesting and  clean  but will  each  key(relevant to the specific  workitem)  have its own value? When I  click  for more details,  does it take me to another page/tab?
Any links to   start investigating this ?   I am fairly new  to JAZZ/RTC

Yes,  I am  no 4.0.0.1 .   Stringlist  attribute?     I have  used   enumeration  but  not stringlist . Will investigate . Up till  now(your comments)  ,,  my best option   looked like  putting the various  key/values  on a separate tab , per earlier  comments,

Any  link to the encoding activities ?    That  sounds interesting and I do need  it for  password that   I may be storing also   so it would be handy
  Thanks for any input

With encoding, I mean storing it as a string. You can usually do that. As URL, whatever. Serialized it. With respect to the presentation, you can put it on a separate tab and potentially make it read only in the UI. It is possible to add own value providers and representations. It is also possible to extend the storage service. I would advise against it. 

Ralph,  
        For now  I  will avoid value providers . I just need to  store and  retrieve   pro-grammatically. I will  testing now with supplying separate field  for  each value and each  key. Not ideal  but will see how far I can get with it
I have attached a screen  shot  of adding them  to separate   tab.  Thanks

If you want to avoid one attribute for each key, use a string list and encode the entries for example as D4_FIRSTCLASSIFIER=<value> where <value> is the data to store. It is easy enough to get the value list of the attribute and manage the data in an extension or Plain Java Client.

Ralph,
     Thanks , I am not  quite  getting your explanation  but I will  review the stringlist   type further and see how it  fits .Or  Are you saying   each workitem  will  have   a stringlist of the  4 classifier keys ( out of  8 )  and  the values   will just be the  scores?   My confusion  is    should I have defined/listed  all 8 possible keys before  I called them  or I can just go ahead  and  add   a stringlist  attribute to the workitem and  that should accommodate the  keys/.values.

Note that  D4_FIRSTCLASSIFIER,etc  are just the labels  to  hold the key name. Then  D4_FIRSTCLASSIFIERSCORE  will  hold the actual  value
Sound  like I  just need to know  how to use the stringlist