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24 Aug 1999: Cost: Multiple versions of Cost (2.1, 2.2) don't like to
live together on the same system (pkgIndex.tcl, 'set COSTLIB ...')
KNOWN BUGS IN XML SUPPORT: [26 Jun 1999]
I've only gotten as far as integrating EXPAT and
adding the [loadxml] command; it's largely untested so far.
Problems that I know about:
+ Does not handle external entities at all;
+ Does not handle Unicode at all (this should be easy to
do under Tcl 8.1, I just haven't learned enough about I18N yet)
+ XML is case-sensitive, whereas the Cost query language
is case-insensitive in several places; need to make sure it's
doing the right thing.
Under Windows: $COSTPATH should be ';'-separated, not ':'-separated.
Ought (?) to check registry instead of relying on envars.
Biggest problem:
Cost is way too damn hard to compile and install.
[24 Jun 1999] Should be a bit better now.
[4 Feb 1999]
Errors in parse_query() should go to Tcl_Interp result, not stderr.
[9 Nov 1998] If sgmls encounters too many errors (esp.
if it can't find the DTD), it seems to produce bad ESIS
on stdout. This hopelessly confuses rdsgmls.c, and can
cause a crash. Need to robustify rdsgmls.
[30 May 1996] Reentrancy problem with 'loadsgmls' --
loading a new document while in the middle of a query,
event handler, or other Cost primitive can crash the
program. [24 Jun 1999] Fixed, sort of. Cost now never
frees the old document.
There are a few (rather large) memory leaks, but none are
disastrous for most applications. In particular, loading a
second or subsequent SGML document does not completely free
earlier ones. [24 Jun 1999: This is now a feature :-(]
Assumes NAMECASE GENERAL YES ENTITY NO
and an 8-bit document character set.
Treats "record-end" characters as "newline" characters.
[26 Sep 1998] This is probably not a bug in Cost.
Does not distinguish SDATA entity references in
attribute values.
SUBDOC support is a little shaky. Does not correctly keep track
of entities in subdocuments.
Only supports
QUANTITY
NAMELEN 8000 -- default: 8 --
LITLEN 8000 -- default: 240 --
PILEN 8000 -- default: 240 --
(8000 is an approximate value.)
Also, more than ~8Kbytes of contiguous character data with no intervening
record-ends or subelements will crash Cost (there is no QUANTITY setting
for this). Other quantities and all CAPACITYs are limited by available
memory.
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