/[webpac]/trunk2/NEWS.pod
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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Contents of /trunk2/NEWS.pod

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Revision 369 - (show annotations)
Thu Jun 17 15:13:02 2004 UTC (15 years, 9 months ago) by dpavlin
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1 =head1 NAME
2
3 Quick overview of things that are new in v2.x of WebPAC
4
5 =head1 DESCRIPTION
6
7 This document will describe new features in WebPAC version v2.x.
8 It will also attempt to document upgrade procedure to migrate
9 WebPAC v1.x installations to new v2.x.
10
11 =head2 Input file handling
12
13 Database files are now read in memory (using swap if not enough
14 memory is not available) and used from there.
15
16 Also, in-memory structure will be dumped to temporary disk
17 cache, so that unchanged databases won't be re-read (and parsed) if source
18 database hasn't changed. Nice consequence of this is that memory lookups
19 are now for free (see below).
20
21 =head2 Two-step processing of databases
22
23 In first step database is read and in-memory structure is created (or
24 read from on-disk cache if source database hasn't changed).
25
26 In second step output formats are created.
27
28 =head2 Lookups
29
30 For a start, lookup files are no longer supported. Since memory lookups
31 are newer and more powerful (for example, each key can have more than
32 one value) it's not a great loss. However, you will have to re-write
33 your C<import_xml> files if you use lookup files to use memory lookups.
34
35 Memory lookups (referred as lookups for new versions of WebPAC) are now
36 available always. Since whole database is available when creating
37 output linking should be much easier now.
38
39 However, using new lookups require to define lookups in different way.
40 Additional benefit of that is conditional insert into lookup using eval.
41
42 =head2 Field definition in C<import_xml>
43
44 Field definitions in C<import_xml> files has changed. Previously, you could
45 write something like C<250a> and expect to get data from field B<250> subfield
46 B<a>. Now you have to write C<v250^a> which is more ISIS-like and easier to
47 parse. Don't be afraid, there is migration script in C<import_xml> to do
48 this task for you.
49
50 =head2 Templates
51
52 Templateing engine has changed. WebPAC doesn't use C<HTML::Template> anymore,
53 but Template Toolkit. TT proved to be workhorse for many tasks
54 and limitations of C<HTML::Template> forced me to move from it.
55
56 For you, the user, that will result in changes to all templates. I'm sorry
57 about this, but it had to be done.

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