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StarterPak/!Newsbase/Docs/General
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
| Tape/disk: | Home » Recent acquisitions » Acorn ADFS disks » adfs_AcornUser_199508.adf » !Internet |
| Filename: | StarterPak/!Newsbase/Docs/General |
| Read OK: | ✔ |
| File size: | 1A6F bytes |
| Load address: | 0000 |
| Exec address: | 0000 |
File contents
Here are some very general notes on how some parts of Newsbase work.
When debatching a file, newsbase first attempts to recognise the type of
batch file by scanning it for valid separators. These consist of lines
beginning with:
#! rmail mail
^A mail (control-A)
From mail (including trailing space)
#! rnews news
If a separator is not found on the first line of the file, newsbase will
'rewind' to the beginning of the file, after attempting recognition. If no
valid separators are found, newsbase tries to guess the batch type by
presence of "Newsgroups:" headers, etc. Headerless parts of the file will be
saved to the groups "Email.postmaster" or "junk" depending on how newsbase
finally recognises it.
From Newsbase 0.43, articles are held in the directory:
group.name.~x.~xN
where N is (article number DIV 75) MOD 75
This now permits many articles to be held without creating an unmanagably
deep directory structure.
(0.52f onwards:) To prevent excessive directory creation, articles which are
either locked, or have an Expires header, are moved back to the
general-purpose directory, group.name.~x.~x, during expiry. This should
avoid the presence of many specifically-numbered directories containing very
few articles. "clari.*" groups are treated differently here; as all articles
have expires headers, this part of the rule is not applied.
Article numbers are assigned for valid groups as soon as the
Newsgroups: line has been decoded. A "Xref:" header line is then inserted
into the article buffer, allowing clients to mark crossposts as read in all
the crossposted groups. Saving then follows the pregenerated group/number
list (allowing up to 10 groups).
From Newsbase 0.23, the "Supersedes:" header is respected, and a superceded
article is deleted (if not locked).
The "Expires:" header is handled by encoding the expiry date within a
file's datastamp for articles which require it (the high byte of the 5-byte
datestamp is set to &FF as a flag; the remaining 4 bytes contain the
expiry date as a 1-word integer in the form CEYRMNDY. Files encoded this
way have an apparent datestamp, to the filing system, sometime in the
year 2247).
Expire code is called on a per-group basis, to simplify index update.
Expired article numbers are added to a delete buffer and are removed from
the group index when the buffer fills or a different group is referenced.
The delete buffer is 512 articles deep (ie, 512 deletions before an index
rewrite is required).
When delete buffer is filled, or a deletion for a different group arrives, the
index is updated to remove entries for deleted articles.
Polling is disabled during an index update; an hourglass is displayed while
this occurs. With a medium-speed hard disk and around 1000 index
entries, an index update generally takes around 2-5 seconds.
Article request by message ID is not currently supported as the lookup is
quite slow (the index file must be scanned).
Index files are held in each group's "root directory", eg
news:rec.audio.~index.
The index file format is fixed-length 200-byte records, one record per article.
The record format is:
bytes 0-3 : article number
bytes 4-7 : record type
For compatibility with old index files, record types >100 are taken as being
type 0 (some versions of newsbase stored the article date in this field).
record type 0:
bytes 8-11: article date (format CEYRMNDY)
bytes 12-19: reserved for extra information.
bytes 20-n: "Message-ID" field, from article header, null-terminated
bytes n-m : "From" field.
bytes m-199 : "Subject field.
record type 1:
bytes 8-11: article date (format CEYRMNDY)
bytes 12-19: reserved for extra information.
bytes 20-n: "Message-ID" field, from article header, null-terminated
bytes n-m : "From" field.
bytes m-o : "Subject field.
bytes o-199: "References" field.
record type 2:
bytes 8-19: unused
bytes 20-199: "References" field.
Fields may be truncated if they do not fit within the record space available.
If no message ID is available in the article header, it is replaced with
"<0>", in accordance with RFC977.
Criteria for design of record structure-
1. Must be easy to access, and fast to add and remove records, even from
BASIC. Fixed record size avoids doing any significant processing.
2. Article information is destinied to be passed to a client program via wimp
messages. The "Article info" message passes the following information:
article number, from, and subject. The maximum amount of data
that can be passed in a wimp message is about 230 bytes.
This scheme works well with small numbers of newsgroups (150 tested but more
should scale fairly linearly) and, with the new directory structure of
Newsbase 0.43, more than 2000 articles per group. Better memory management
will be needed within NewsBase to deal with many more groups, but that is an
internal implementation issue. See the file "Tuning" for information on how
to tailor newsbase for larger newsfeeds.
The from and subject strings returned by "ListArticles" are length limited
and intended for display (in article catalogues) only. Use the fields
directly from the article headers for generating replies, etc.
References headers stored in the index file are limited to 200 characters
max. If a references list is longer than this, newsbase will attempt to
store it intelligently by omitting references from the middle of the list so
as to preserve information about the original and most recent parent
articles. This should permit adequate threading of articles.
The pathname returned by "article get" should be used once and not stored
across calls to Wimp_Poll. It is possible for article files to move without
notification (generally only at debatch or expiry time)
"Article delete" is included to complete the command set, but should
probably not be used in a multiple-reader environment. It will not be
effective against locked articles. One situation where the function might
be useful is to delete personal email - in this situation, deletion will
always be permitted. For other groups, deletion may be disabled as a
newsbase configuration option.
It is the responsibility of the newsbase client to track which articles and
groups a reader is interested in, or has read.
"Article lock" prevents an article from being deleted or expired, regardless
of expiry date.
Mail batches are mistakenly split on lines starting "From ". The extra bit
of message is saved to Email.postmaster (problem mail) with a suitable
subject (no recipient?) rather than into a group "Email" as currently.
Using the ka9q transport, this is only seen with POP (SMTP alters these
lines to ">From "). This can be avoided by using ^A or "#! rmail" separators.
00000000 48 65 72 65 20 61 72 65 20 73 6f 6d 65 20 76 65 |Here are some ve| 00000010 72 79 20 67 65 6e 65 72 61 6c 20 6e 6f 74 65 73 |ry general notes| 00000020 20 6f 6e 20 68 6f 77 20 73 6f 6d 65 20 70 61 72 | on how some par| 00000030 74 73 20 6f 66 20 4e 65 77 73 62 61 73 65 20 77 |ts of Newsbase w| 00000040 6f 72 6b 2e 0a 0a 57 68 65 6e 20 64 65 62 61 74 |ork...When debat| 00000050 63 68 69 6e 67 20 61 20 66 69 6c 65 2c 20 6e 65 |ching a file, ne| 00000060 77 73 62 61 73 65 20 66 69 72 73 74 20 61 74 74 |wsbase first att| 00000070 65 6d 70 74 73 20 74 6f 20 72 65 63 6f 67 6e 69 |empts to recogni| 00000080 73 65 20 74 68 65 20 74 79 70 65 20 6f 66 0a 62 |se the type of.b| 00000090 61 74 63 68 20 66 69 6c 65 20 62 79 20 73 63 61 |atch file by sca| 000000a0 6e 6e 69 6e 67 20 69 74 20 66 6f 72 20 76 61 6c |nning it for val| 000000b0 69 64 20 73 65 70 61 72 61 74 6f 72 73 2e 20 54 |id separators. T| 000000c0 68 65 73 65 20 63 6f 6e 73 69 73 74 20 6f 66 20 |hese consist of | 000000d0 6c 69 6e 65 73 0a 62 65 67 69 6e 6e 69 6e 67 20 |lines.beginning | 000000e0 77 69 74 68 3a 0a 0a 23 21 20 72 6d 61 69 6c 20 |with:..#! rmail | 000000f0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 6d | m| 00000100 61 69 6c 0a 5e 41 20 20 20 20 20 20 20 20 20 20 |ail.^A | 00000110 20 20 20 20 20 20 20 20 20 20 20 20 6d 61 69 6c | mail| 00000120 20 28 63 6f 6e 74 72 6f 6c 2d 41 29 0a 46 72 6f | (control-A).Fro| 00000130 6d 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 |m | 00000140 20 20 20 20 20 6d 61 69 6c 20 28 69 6e 63 6c 75 | mail (inclu| 00000150 64 69 6e 67 20 74 72 61 69 6c 69 6e 67 20 73 70 |ding trailing sp| 00000160 61 63 65 29 0a 23 21 20 72 6e 65 77 73 20 20 20 |ace).#! rnews | 00000170 20 20 20 20 20 20 20 20 20 20 20 20 20 6e 65 77 | new| 00000180 73 0a 0a 49 66 20 61 20 73 65 70 61 72 61 74 6f |s..If a separato| 00000190 72 20 69 73 20 6e 6f 74 20 66 6f 75 6e 64 20 6f |r is not found o| 000001a0 6e 20 74 68 65 20 66 69 72 73 74 20 6c 69 6e 65 |n the first line| 000001b0 20 6f 66 20 74 68 65 20 66 69 6c 65 2c 20 6e 65 | of the file, ne| 000001c0 77 73 62 61 73 65 20 77 69 6c 6c 0a 27 72 65 77 |wsbase will.'rew| 000001d0 69 6e 64 27 20 74 6f 20 74 68 65 20 62 65 67 69 |ind' to the begi| 000001e0 6e 6e 69 6e 67 20 6f 66 20 74 68 65 20 66 69 6c |nning of the fil| 000001f0 65 2c 20 61 66 74 65 72 20 61 74 74 65 6d 70 74 |e, after attempt| 00000200 69 6e 67 20 72 65 63 6f 67 6e 69 74 69 6f 6e 2e |ing recognition.| 00000210 20 49 66 20 6e 6f 0a 76 61 6c 69 64 20 73 65 70 | If no.valid sep| 00000220 61 72 61 74 6f 72 73 20 61 72 65 20 66 6f 75 6e |arators are foun| 00000230 64 2c 20 6e 65 77 73 62 61 73 65 20 74 72 69 65 |d, newsbase trie| 00000240 73 20 74 6f 20 67 75 65 73 73 20 74 68 65 20 62 |s to guess the b| 00000250 61 74 63 68 20 74 79 70 65 20 62 79 0a 70 72 65 |atch type by.pre| 00000260 73 65 6e 63 65 20 6f 66 20 22 4e 65 77 73 67 72 |sence of "Newsgr| 00000270 6f 75 70 73 3a 22 20 68 65 61 64 65 72 73 2c 20 |oups:" headers, | 00000280 65 74 63 2e 20 48 65 61 64 65 72 6c 65 73 73 20 |etc. Headerless | 00000290 70 61 72 74 73 20 6f 66 20 74 68 65 20 66 69 6c |parts of the fil| 000002a0 65 20 77 69 6c 6c 20 62 65 0a 73 61 76 65 64 20 |e will be.saved | 000002b0 74 6f 20 74 68 65 20 67 72 6f 75 70 73 20 22 45 |to the groups "E| 000002c0 6d 61 69 6c 2e 70 6f 73 74 6d 61 73 74 65 72 22 |mail.postmaster"| 000002d0 20 6f 72 20 22 6a 75 6e 6b 22 20 64 65 70 65 6e | or "junk" depen| 000002e0 64 69 6e 67 20 6f 6e 20 68 6f 77 20 6e 65 77 73 |ding on how news| 000002f0 62 61 73 65 0a 66 69 6e 61 6c 6c 79 20 72 65 63 |base.finally rec| 00000300 6f 67 6e 69 73 65 73 20 69 74 2e 0a 0a 46 72 6f |ognises it...Fro| 00000310 6d 20 4e 65 77 73 62 61 73 65 20 30 2e 34 33 2c |m Newsbase 0.43,| 00000320 20 61 72 74 69 63 6c 65 73 20 61 72 65 20 68 65 | articles are he| 00000330 6c 64 20 69 6e 20 74 68 65 20 64 69 72 65 63 74 |ld in the direct| 00000340 6f 72 79 3a 0a 67 72 6f 75 70 2e 6e 61 6d 65 2e |ory:.group.name.| 00000350 7e 78 2e 7e 78 4e 0a 77 68 65 72 65 20 4e 20 69 |~x.~xN.where N i| 00000360 73 20 28 61 72 74 69 63 6c 65 20 6e 75 6d 62 65 |s (article numbe| 00000370 72 20 44 49 56 20 37 35 29 20 4d 4f 44 20 37 35 |r DIV 75) MOD 75| 00000380 0a 54 68 69 73 20 6e 6f 77 20 70 65 72 6d 69 74 |.This now permit| 00000390 73 20 6d 61 6e 79 20 61 72 74 69 63 6c 65 73 20 |s many articles | 000003a0 74 6f 20 62 65 20 68 65 6c 64 20 77 69 74 68 6f |to be held witho| 000003b0 75 74 20 63 72 65 61 74 69 6e 67 20 61 6e 20 75 |ut creating an u| 000003c0 6e 6d 61 6e 61 67 61 62 6c 79 0a 64 65 65 70 20 |nmanagably.deep | 000003d0 64 69 72 65 63 74 6f 72 79 20 73 74 72 75 63 74 |directory struct| 000003e0 75 72 65 2e 0a 0a 28 30 2e 35 32 66 20 6f 6e 77 |ure...(0.52f onw| 000003f0 61 72 64 73 3a 29 20 54 6f 20 70 72 65 76 65 6e |ards:) To preven| 00000400 74 20 65 78 63 65 73 73 69 76 65 20 64 69 72 65 |t excessive dire| 00000410 63 74 6f 72 79 20 63 72 65 61 74 69 6f 6e 2c 20 |ctory creation, | 00000420 61 72 74 69 63 6c 65 73 20 77 68 69 63 68 20 61 |articles which a| 00000430 72 65 0a 65 69 74 68 65 72 20 6c 6f 63 6b 65 64 |re.either locked| 00000440 2c 20 6f 72 20 68 61 76 65 20 61 6e 20 45 78 70 |, or have an Exp| 00000450 69 72 65 73 20 68 65 61 64 65 72 2c 20 61 72 65 |ires header, are| 00000460 20 6d 6f 76 65 64 20 62 61 63 6b 20 74 6f 20 74 | moved back to t| 00000470 68 65 0a 67 65 6e 65 72 61 6c 2d 70 75 72 70 6f |he.general-purpo| 00000480 73 65 20 64 69 72 65 63 74 6f 72 79 2c 20 67 72 |se directory, gr| 00000490 6f 75 70 2e 6e 61 6d 65 2e 7e 78 2e 7e 78 2c 20 |oup.name.~x.~x, | 000004a0 64 75 72 69 6e 67 20 65 78 70 69 72 79 2e 20 54 |during expiry. T| 000004b0 68 69 73 20 73 68 6f 75 6c 64 0a 61 76 6f 69 64 |his should.avoid| 000004c0 20 74 68 65 20 70 72 65 73 65 6e 63 65 20 6f 66 | the presence of| 000004d0 20 6d 61 6e 79 20 73 70 65 63 69 66 69 63 61 6c | many specifical| 000004e0 6c 79 2d 6e 75 6d 62 65 72 65 64 20 64 69 72 65 |ly-numbered dire| 000004f0 63 74 6f 72 69 65 73 20 63 6f 6e 74 61 69 6e 69 |ctories containi| 00000500 6e 67 20 76 65 72 79 0a 66 65 77 20 61 72 74 69 |ng very.few arti| 00000510 63 6c 65 73 2e 20 22 63 6c 61 72 69 2e 2a 22 20 |cles. "clari.*" | 00000520 67 72 6f 75 70 73 20 61 72 65 20 74 72 65 61 74 |groups are treat| 00000530 65 64 20 64 69 66 66 65 72 65 6e 74 6c 79 20 68 |ed differently h| 00000540 65 72 65 3b 20 61 73 20 61 6c 6c 20 61 72 74 69 |ere; as all arti| 00000550 63 6c 65 73 0a 68 61 76 65 20 65 78 70 69 72 65 |cles.have expire| 00000560 73 20 68 65 61 64 65 72 73 2c 20 74 68 69 73 20 |s headers, this | 00000570 70 61 72 74 20 6f 66 20 74 68 65 20 72 75 6c 65 |part of the rule| 00000580 20 69 73 20 6e 6f 74 20 61 70 70 6c 69 65 64 2e | is not applied.| 00000590 0a 0a 41 72 74 69 63 6c 65 20 6e 75 6d 62 65 72 |..Article number| 000005a0 73 20 61 72 65 20 61 73 73 69 67 6e 65 64 20 66 |s are assigned f| 000005b0 6f 72 20 76 61 6c 69 64 20 67 72 6f 75 70 73 20 |or valid groups | 000005c0 61 73 20 73 6f 6f 6e 20 61 73 20 74 68 65 0a 4e |as soon as the.N| 000005d0 65 77 73 67 72 6f 75 70 73 3a 20 6c 69 6e 65 20 |ewsgroups: line | 000005e0 68 61 73 20 62 65 65 6e 20 64 65 63 6f 64 65 64 |has been decoded| 000005f0 2e 20 41 20 22 58 72 65 66 3a 22 20 68 65 61 64 |. A "Xref:" head| 00000600 65 72 20 6c 69 6e 65 20 69 73 20 74 68 65 6e 20 |er line is then | 00000610 69 6e 73 65 72 74 65 64 0a 69 6e 74 6f 20 74 68 |inserted.into th| 00000620 65 20 61 72 74 69 63 6c 65 20 62 75 66 66 65 72 |e article buffer| 00000630 2c 20 61 6c 6c 6f 77 69 6e 67 20 63 6c 69 65 6e |, allowing clien| 00000640 74 73 20 74 6f 20 6d 61 72 6b 20 63 72 6f 73 73 |ts to mark cross| 00000650 70 6f 73 74 73 20 61 73 20 72 65 61 64 20 69 6e |posts as read in| 00000660 20 61 6c 6c 0a 74 68 65 20 63 72 6f 73 73 70 6f | all.the crosspo| 00000670 73 74 65 64 20 67 72 6f 75 70 73 2e 20 53 61 76 |sted groups. Sav| 00000680 69 6e 67 20 74 68 65 6e 20 66 6f 6c 6c 6f 77 73 |ing then follows| 00000690 20 74 68 65 20 70 72 65 67 65 6e 65 72 61 74 65 | the pregenerate| 000006a0 64 20 67 72 6f 75 70 2f 6e 75 6d 62 65 72 0a 6c |d group/number.l| 000006b0 69 73 74 20 28 61 6c 6c 6f 77 69 6e 67 20 75 70 |ist (allowing up| 000006c0 20 74 6f 20 31 30 20 67 72 6f 75 70 73 29 2e 0a | to 10 groups)..| 000006d0 0a 46 72 6f 6d 20 4e 65 77 73 62 61 73 65 20 30 |.From Newsbase 0| 000006e0 2e 32 33 2c 20 74 68 65 20 22 53 75 70 65 72 73 |.23, the "Supers| 000006f0 65 64 65 73 3a 22 20 68 65 61 64 65 72 20 69 73 |edes:" header is| 00000700 20 72 65 73 70 65 63 74 65 64 2c 20 61 6e 64 20 | respected, and | 00000710 61 20 73 75 70 65 72 63 65 64 65 64 0a 61 72 74 |a superceded.art| 00000720 69 63 6c 65 20 69 73 20 64 65 6c 65 74 65 64 20 |icle is deleted | 00000730 28 69 66 20 6e 6f 74 20 6c 6f 63 6b 65 64 29 2e |(if not locked).| 00000740 0a 0a 54 68 65 20 22 45 78 70 69 72 65 73 3a 22 |..The "Expires:"| 00000750 20 68 65 61 64 65 72 20 69 73 20 68 61 6e 64 6c | header is handl| 00000760 65 64 20 62 79 20 65 6e 63 6f 64 69 6e 67 20 74 |ed by encoding t| 00000770 68 65 20 65 78 70 69 72 79 20 64 61 74 65 20 77 |he expiry date w| 00000780 69 74 68 69 6e 20 61 0a 66 69 6c 65 27 73 20 64 |ithin a.file's d| 00000790 61 74 61 73 74 61 6d 70 20 66 6f 72 20 61 72 74 |atastamp for art| 000007a0 69 63 6c 65 73 20 77 68 69 63 68 20 72 65 71 75 |icles which requ| 000007b0 69 72 65 20 69 74 20 28 74 68 65 20 68 69 67 68 |ire it (the high| 000007c0 20 62 79 74 65 20 6f 66 20 74 68 65 20 35 2d 62 | byte of the 5-b| 000007d0 79 74 65 0a 64 61 74 65 73 74 61 6d 70 20 69 73 |yte.datestamp is| 000007e0 20 73 65 74 20 74 6f 20 26 46 46 20 61 73 20 61 | set to &FF as a| 000007f0 20 66 6c 61 67 3b 20 74 68 65 20 72 65 6d 61 69 | flag; the remai| 00000800 6e 69 6e 67 20 34 20 62 79 74 65 73 20 63 6f 6e |ning 4 bytes con| 00000810 74 61 69 6e 20 74 68 65 0a 65 78 70 69 72 79 20 |tain the.expiry | 00000820 64 61 74 65 20 61 73 20 61 20 31 2d 77 6f 72 64 |date as a 1-word| 00000830 20 69 6e 74 65 67 65 72 20 69 6e 20 74 68 65 20 | integer in the | 00000840 66 6f 72 6d 20 43 45 59 52 4d 4e 44 59 2e 20 46 |form CEYRMNDY. F| 00000850 69 6c 65 73 20 65 6e 63 6f 64 65 64 20 74 68 69 |iles encoded thi| 00000860 73 0a 77 61 79 20 68 61 76 65 20 61 6e 20 61 70 |s.way have an ap| 00000870 70 61 72 65 6e 74 20 64 61 74 65 73 74 61 6d 70 |parent datestamp| 00000880 2c 20 74 6f 20 74 68 65 20 66 69 6c 69 6e 67 20 |, to the filing | 00000890 73 79 73 74 65 6d 2c 20 73 6f 6d 65 74 69 6d 65 |system, sometime| 000008a0 20 69 6e 20 74 68 65 0a 79 65 61 72 20 32 32 34 | in the.year 224| 000008b0 37 29 2e 0a 0a 45 78 70 69 72 65 20 63 6f 64 65 |7)...Expire code| 000008c0 20 69 73 20 63 61 6c 6c 65 64 20 6f 6e 20 61 20 | is called on a | 000008d0 70 65 72 2d 67 72 6f 75 70 20 62 61 73 69 73 2c |per-group basis,| 000008e0 20 74 6f 20 73 69 6d 70 6c 69 66 79 20 69 6e 64 | to simplify ind| 000008f0 65 78 20 75 70 64 61 74 65 2e 0a 45 78 70 69 72 |ex update..Expir| 00000900 65 64 20 61 72 74 69 63 6c 65 20 6e 75 6d 62 65 |ed article numbe| 00000910 72 73 20 61 72 65 20 61 64 64 65 64 20 74 6f 20 |rs are added to | 00000920 61 20 64 65 6c 65 74 65 20 62 75 66 66 65 72 20 |a delete buffer | 00000930 61 6e 64 20 61 72 65 20 72 65 6d 6f 76 65 64 20 |and are removed | 00000940 66 72 6f 6d 0a 74 68 65 20 67 72 6f 75 70 20 69 |from.the group i| 00000950 6e 64 65 78 20 77 68 65 6e 20 74 68 65 20 62 75 |ndex when the bu| 00000960 66 66 65 72 20 66 69 6c 6c 73 20 6f 72 20 61 20 |ffer fills or a | 00000970 64 69 66 66 65 72 65 6e 74 20 67 72 6f 75 70 20 |different group | 00000980 69 73 20 72 65 66 65 72 65 6e 63 65 64 2e 0a 0a |is referenced...| 00000990 54 68 65 20 64 65 6c 65 74 65 20 62 75 66 66 65 |The delete buffe| 000009a0 72 20 69 73 20 35 31 32 20 61 72 74 69 63 6c 65 |r is 512 article| 000009b0 73 20 64 65 65 70 20 28 69 65 2c 20 35 31 32 20 |s deep (ie, 512 | 000009c0 64 65 6c 65 74 69 6f 6e 73 20 62 65 66 6f 72 65 |deletions before| 000009d0 20 61 6e 20 69 6e 64 65 78 0a 72 65 77 72 69 74 | an index.rewrit| 000009e0 65 20 69 73 20 72 65 71 75 69 72 65 64 29 2e 0a |e is required)..| 000009f0 0a 57 68 65 6e 20 64 65 6c 65 74 65 20 62 75 66 |.When delete buf| 00000a00 66 65 72 20 69 73 20 66 69 6c 6c 65 64 2c 20 6f |fer is filled, o| 00000a10 72 20 61 20 64 65 6c 65 74 69 6f 6e 20 66 6f 72 |r a deletion for| 00000a20 20 61 20 64 69 66 66 65 72 65 6e 74 20 67 72 6f | a different gro| 00000a30 75 70 20 61 72 72 69 76 65 73 2c 20 74 68 65 0a |up arrives, the.| 00000a40 69 6e 64 65 78 20 69 73 20 75 70 64 61 74 65 64 |index is updated| 00000a50 20 74 6f 20 72 65 6d 6f 76 65 20 65 6e 74 72 69 | to remove entri| 00000a60 65 73 20 66 6f 72 20 64 65 6c 65 74 65 64 20 61 |es for deleted a| 00000a70 72 74 69 63 6c 65 73 2e 0a 0a 50 6f 6c 6c 69 6e |rticles...Pollin| 00000a80 67 20 69 73 20 64 69 73 61 62 6c 65 64 20 64 75 |g is disabled du| 00000a90 72 69 6e 67 20 61 6e 20 69 6e 64 65 78 20 75 70 |ring an index up| 00000aa0 64 61 74 65 3b 20 61 6e 20 68 6f 75 72 67 6c 61 |date; an hourgla| 00000ab0 73 73 20 69 73 20 64 69 73 70 6c 61 79 65 64 20 |ss is displayed | 00000ac0 77 68 69 6c 65 0a 74 68 69 73 20 6f 63 63 75 72 |while.this occur| 00000ad0 73 2e 20 57 69 74 68 20 61 20 6d 65 64 69 75 6d |s. 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