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- LIMITATIONS
-
- The current version of Istar has a number of limitations. Some of them
- include:
-
- # Cannot import to KB from another KB.
- # The FIRSTOK inference method (Present Each To User) not yet
- implemented.
- # Cannot use the Import-Text yet on items.
- # Cannot at present delete value names from an attribute type; can only
- add them.
- # Certain obscure conversions between value types do not work fully; best
- to try them out before you use them. e.g. Float to Odds.
- # The new text/document facility is at present very limited.
-
-
- BUGS
-
- This is a list of some bugs you should be aware of.
-
- # (Can be misleading to user) The explanation of a relationship type is
- only accurate for simple types; the facility is yet to be finalized.
- Version 1.04 and earlier.
-
- # (Nuisance) Recently I had things like DirOpus loaded, and went to load
- up three KBs with full size easels. Then tried to 'rid' a KB and nothing
- happened. Tried to quit and nothing happened. Because I had run out of
- Chip memory and the small "Is it OK to rid the KB?" panel would not come
- up! (Chip memory was down to 13k.) But beware: there is no warning, and
- none can be given because the warning panel will not come up.
-
- # (Harmless limitation) Various buttons are not operative yet:
- Clone item type
- Import text into item
- You might find others that either flash or do nowt
-
- # (Harmless limitation) Conversion Float to Odds does not work.
-
- # (Could lead to unexpected results in your KB) When a conversion does
- not work you do not get any warning of this fact. What happens depends on
- the type of conversion, but often the result holds the bit pattern of the
- uncoverted value, which might of course seem like rubbish, or might hold 0.
- 30 July 1996.
-
- # (Cosmetic, harmless; PARTLY FIXED) Version 1.02: A Form item does not
- space out the value gadgets properly always. Some of them are too tall and
- overlap others. 2 August 1996. This is being investigated. It has been
- partly cured (still untidy) in Version 1.03.
-
-
- CRASHES ENCOUNTERED
-
- (Please: it you have it crash on you, send me details.
- Istar@basden.demon.co.uk). The following crashes I have experienced and
- not yet found the cause of.
-
- # (1.04: Probably OK from 1.05. Can cause crash, but avoidable) The
- resize KB facility can be a bit fragile and can cause a crash in version
- 1.04. This is because if the KB increases in size it moves in memory and
- therefore all the pointers into it must all be changed. I *think* I have
- found all these, but I did once get a guru 81---5 (attempt to free memory
- already freed) when I quit the program. I have a feeling it was something
- to do with resizing. For this reason, before you attempt to resize you
- should close down all panels except that for the KB itself.
-
-
-
- BUGS FIXED
-
- BY VERSION 6 (Feb 1997)
-
- # (Nuisance to end user in versions 1.05 and earlier) The Chooser
- inference method would only reset its attribute to unanswered every other
- time, not every time. A bug in dealing with first (index) antecedent.
- Fixed after 1.05.
-
- # (Nuisance in version 1.04, corrected 1.041) A bug entered V1.04 that I
- found two days after placing it on Aminet! It would not allow you to
- change value types in the Attribute Details panel. Immediately corrected
- it and placed new version 1.041 on Aminet.
-
- # Bug when adding new attribute to items with shown attributes. The new
- one would be placed on top of old one. Now it's OK; they are placed in a
- vertical column.
-
-
- BY VERSION 1.05 (Jan 1997)
-
- # (A freeze if not a crash!) There's an odd sort of bug when Istar runs
- up on some machines. It's perfectly OK on the three 1200s that I have
- tried it on (020 and 030). But when I run it up on my 4000 it comes up
- with the main easel and the SIT (Select Item Type) panel and all, but won't
- draw, and won't respond to clicks on the main control panel. Until, that
- is, I click around on the SIT panel. Sometimes dragging the listview
- scroll bar around helps, and then clicking to select an item type,
- sometimes clicking on the 'New' button. Then there is a delay of a few
- seconds, and everything starts as normal. Strange. But, as I say, on my
- three 1200s it seems perfectly OK. 9.9.96: I have found a possible cause
- of this and corrected it, but have yet to try it out. No, it does not work
- yet, Nov 1996. I got an email to say that it froze their 3000 too. While
- preparing 1.05 I found a slight error in the code, changed it, and then it
- seemed to work on my 4000 and 3000. So hopefully it's now OK.
-
-
- BUGS FIXED BY VERSION 1.04 (Nov 1996)
-
- # (Harmless Cosmetic) When you change the name of an item, it doesn't
- redraw with the new name until F1 or next load. Attribute names refresh
- OK. Version 1.03 and before.
-
- # (Harmless Nuisance) When trying to resize an item using right-shift,
- you have to place the mouse *exactly* on the edge of the box: hit-vicinity
- is zero. Otherwise you will start to draw a link or move the box; if that
- happens then just hit escape. Version 1.03 and before. (Actually, it was
- not the need for exact positioning: it required a second attempt. A bug in
- window switching.)
-
- # (Harmless cosmetic) When you start drawing on the main easel and abort
- by hitting escape you get a beep-flash. Don't worry: nothing is wrong.
- Version 1.03 and before.
-
- # (Harmless nuisance) New facility in Version 1.03, Resizing of KBA,
- doesn't work; it leaves the KBA as it is.
-
- # (Harmless nuisance) The Backup button on the KB Area panel (Version
- 1.03) has no effect.
-
- # (Harmless cosmetic nuisance) Renaming the KB Area sometimes leaves
- rubbish characters at the end. Version 1.03.
-
- # (Harmless, cosmetic) When you reset an attribute that is in the middle
- of a network it propagates the unanswered status OK, but does not show this
- change in status on the easel. So if the Att is e.g. Bayesian and Shown it
- retains the solid black line.
-
- # (Frustrating but probably harmless) Version 1.03: When you have two
- KBs active, and go to the Item Type Panel, and hit the Left or Right
- RelTypes buttons nothing happens. But when you get rid of all but one then
- the list of RelTypes appears OK. 5 August 1996. This is being
- investigated.
-
-
- BUGS FIXED BY VERSION 1.03 (Sep 1996)
-
- # FIXED. Version 1.02: Never press the three right hand gadgets of the
- name/meaning bar unless a knowledge base is present. It will probably
- crash the machine or send it into an infinite loop since they assume one is
- present. 2 August 1996. This has been corrected in version 1.03.
-
- # Version 1.02: When redirecting a link the DAG cycle detection algorithm
- sometimes says there is a loop when there is not. 2 August 1996. This is
- being investigated. 12 September 1996: I have found the bug: it
- occasionally searched from the wrong node. Now it should be OK in Version
- 1.03.
-
- # Version 1.02. It occasionally crashed while linking two items. I have
- found a bug that could do this, and corrected it. Version 1.03 should be
- OK.
-
-
- Copyright (c) Andrew Basden, 1996
-