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Python script check for existence of variable - there has to be a better way to do this.
by Ria Marinussen 13 Jun '02

13 Jun '02

Hi, In a database I have some information about our employees. Some fields are not filled in, so there value is NULL. When iterating over the results of a ZSQL query (select * from "Medewerkers") the non-existent variables (value=NULL) are reported with the word "None". I don't want show this keyword in my report-table, so I've created a python script that checks for the existence of the variable, and when it doesn't exist, I fill in a non-breaking space html -code. Basically I do two things in the script: I check the parameter and generate the name of the variable (that has to be checked)based on the parameter entered. Next I generate the output and return it. I'm convinced that the first part (check parameter, generate variablenaam to check) can be done in a more elegant way (less code), but trying to concatenate the value of the parameter to "context." isn't working.... Ideas, anyone? I use this (and more) in my dtml-document: <table> <tr> <td><dtml-var "bestaat(test='voorletters')"></td> <td><dtml-var "bestaat(test='voorvoegsel')"></td> <td><dtml-var "bestaat(test='achternaam')"></td> </tr> </table> The script is named "bestaat": ## Parameter list test ## Bound Names context, container, script, _, traverse_subpath # Check the input and set the variable to check if test == 'voorletters': quest = context.voorletters elif test == 'voorvoegsel': quest = context.voorvoegsel elif test == 'titel': quest = context.titel elif test == 'telefoon': quest = context.telefoon elif test == 'telefoon_bgg': quest = context.telefoon_bgg elif test == 'login': quest = context.login elif test == 'leerstoel': quest = context.leerstoel elif test == 'kamernr': quest = context.kamernr elif test == 'geslacht': quest = context.geslacht elif test == 'foto': quest = context.foto elif test == 'faculteit1': quest = context.faculteit1 elif test == 'faculteit2': quest = context.faculteit2 elif test == 'emailadres': quest = context.emailadres elif test == 'achternaam': quest = context.achternaam else: quest = 'missing' # Generate the output if not quest: regel=' ' else: regel=quest return regel TIA, Ria Marinussen Webmaster Department of Computer Science University of Twente The Netherlands

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Create level up link with ZPT (TAL)
by Nico de Boer 13 Jun '02

13 Jun '02

Hi, I want to create a level up link in my ZPT. I've done this in Python and it looks like this: def news_levelup(self): """return a hyperlink to the parentobject if there is one""" s = '' if self.REQUEST['PARENTS'][1].meta_type == 'News': if len(self.REQUEST['PARENTS'][1].level_up_txt) > 2: s = s + '<a class="gnawlink" href="%s">%s</a><br />' \ % (self.REQUEST['PARENTS'][1].absolute_url(), self.REQUEST['PARENTS'][1].level_up_txt ) else: s = s + '<a class="gnawlink" href="%s"><img src="%s" border="0" \ alt="level up"></a><br />' \ % (self.REQUEST['PARENTS'][1].absolute_url(), self.REQUEST['PARENTS'][1].upfolder ) return s else: return '' I've tried the following, but that doesn't work: <span tal:condition="python:here.has_parents()"> <a class="gnawlink" href="" tal:attributes="href container/absolute_url" tal:content="container/level_up_txt"> <img src="placeholder.gif" width="16" height="16" border="0" alt="item" tal:attributes="src here/upfolder; alt here/meta_type" /></a> </span> The python method has_parents checks if the current object has a parent of the same metatype. Can somebody help me out? Greetz Nico

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nested dtml-with
by Paz 13 Jun '02

13 Jun '02

Greetings all, I have two snippets of code, the later I wish would work. Can anyone point out why? The structure: / folder1 / index_html folder2 / index_html This works: <dtml-with folder1> <dtml-var index_html> <dtml-with folder2> <dtml-var index_html> </dtml-with> </dtml-with> This doesn't: <dtml-in "['folder1', 'folder2']"> <dtml-with "_.getitem(_['sequence-item'])"> <dtml-var index_html> </dtml-with> </dtml-in> I'd like the second to work. If I inject that with a try/except I find the first iteration works, but the second raises a key error. Can someone help? Thanks as always, Paz

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Using ZClass in LocalFS
by Samyem Tuladhar 13 Jun '02

13 Jun '02

Is there a way to use ZClasses with LocalFS? Just like it is possible to make DTML Document inside Zope from FS, isn't there a way to use our own ZClass instead? I tried to modify in the 'edit' tab and added my own type of file extention. It looks like this right now: .tem text/html Control_Panel.Products.MyProduct.MyZClass Which obviously does not work. So how to make it work? Thanks, Samyem

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access document contents in DTML
by Aseem Mohanty 13 Jun '02

13 Jun '02

Hi all, If I have a DTML document that contains three other DTML documents (which basically contain some forms), in the following manner: doc1 doc a doc b doc c /doc1 where the component docs are doca forma /doca docb formb /docb docc formc /docc is there any way that I can find out in doc c whther or not there are any form elements of the same name if and when doc c is embedded in another doc. ie in doc c I would have a condition : <dtml-if "not form-el-name anywhere in container"> do blah <dtml-else> do booh </dtml-if> so that in doc 1 if any other sub-docs contain the same form-el name doc c publishes blah else it publishes booh. (I beleive it can be done via PyScript but each form has lots of HTML and I dont want to print all over the place and return printed) TIA AM -- ================================================================== Aseem Mohanty Neurobehavioral Systems Inc, 828 San Pablo Ave, Albany, CA 94706 (R) 510 7696011 (M) 510 3014871 (O) 510 5279231 ================================================================== "I saw `cout' being shifted "Hello world" times to the left and stopped right there!!" -- Steve Gonedes ==================================================================

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RE: [Zope] REQUEST problem
by Chris Beaven 13 Jun '02

13 Jun '02

If you're redirecting, the redirected page will have it's own REQUEST - not the one you are currently dealing with. If you wanted to pass it you could try: <dtml-call "RESPONSE.redirect('another_form_doc?my_test=test_val')"> -----Original Message----- From: Aseem Mohanty [mailto:aseem@neurobehavioralsystems.com] Sent: Thursday, 13 June 2002 1:44 a.m. To: zope(a)zope.org Subject: [Zope] REQUEST problem Hi, if I have the following two DTML statements: <dtml-call "REQUEST.set('my_test','test_val')"> <dtml-call "RESPONSE.redirect('another_form_doc')"> Shouldn't the REQUEST header in the another_form_doc have the attribute 'my_test'?? Or am I missing something big-time here?? TIA AM _______________________________________________ Zope maillist - Zope(a)zope.org http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )

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RE: [Zope] FCGI like functionality inside Zope.
by Graham King 13 Jun '02

13 Jun '02

Hi Daniel, since Zope has FCGI built-in, and if you wanted to use that, then your 3PP applications would have to incorporate FastCGI client software. The FastCGI site has detailed doco on how to write this, and implies serious programming to develop it, but it can be done. Otherwise, you could look at source of the FastCGI python functions in Zope and emulate that to interface with your 3PP's interfaces. Graham -----Original Message----- From: Daniel Mahler [mailto:mahler@cyc.com] Sent: Thursday, 13 June 2002 8:58 To: zope(a)zope.org Subject: [Zope] FCGI like functionality inside Zope. Hi, Looking at the docs it lookes like Zope can be made to play nice with FCGI scripts if it is running behind Apache. However, I have am using Zope without Apache and using extension methods and products to build my application. Now I need to incorporate some 3rd party apps, which have a long startup (setf vm-auto-get-new-mail 600) time. So I am looking for a way of doing something like fcgi from inside Zope itself. Any suggestions? Thanks Daniel _______________________________________________ Zope maillist - Zope(a)zope.org http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )

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slightly OT - Apache configs
by Graham King 13 Jun '02

13 Jun '02

Hi all, Just a note of warning... We had switched a particular Zope application from using PCGI to ProxyPass/VirtualHost yesterday. Prior to switching on the ProxyPass, it was normal Apache stuff pointing to the cgi-bin, and so on. We had also used ReWrite to redirect customer webpages with tilda (~) to another server, eg: RewriteRule /~(.+) http://otherserver/~$1 to user's private webpage ProxyPass / http://localhost...../VHM etc **This no longer works for the RewriteRule.** The Rewrite Rule was overridden by the ProxyPass, and we were getting Zope errors for ../~abc not found (of course). So I used a 2nd RewriteRule instead of ProxyPass and, Lo! all is well. RewriteRule /(.*) http://localhost..../VHM cheers Graham

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FCGI like functionality inside Zope.
by Daniel Mahler 12 Jun '02

12 Jun '02

Hi, Looking at the docs it lookes like Zope can be made to play nice with FCGI scripts if it is running behind Apache. However, I have am using Zope without Apache and using extension methods and products to build my application. Now I need to incorporate some 3rd party apps, which have a long startup (setf vm-auto-get-new-mail 600) time. So I am looking for a way of doing something like fcgi from inside Zope itself. Any suggestions? Thanks Daniel

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Zope Integrated Library System
by Tim Chase 12 Jun '02

12 Jun '02

This post is a long introduction to the concept of an Integrated Library System (ILS). I will gloss over many historical points. Feel free to correct or supplement any of the information below. Some major components of an ILS are (1) a catalog system with an online public access interface (OPAC) and a cataloging interface for adding and changing bibliographic records; can import and export MARC records; Z39.50 interface; authority control (see below) (2) a patron (or member) system, which holds information about patrons, their level of access, current materials borrowed, etc. (3) a circulation system, which tracks the location and status of items as they are borrowed, returned, sent for repair, etc. Historical data, such as total circulation and circulation by period is important. Should also include a reserve and request system (see below) (4) serials control. Serials are a different beast from monographs (books). A library may have subscriptions to thousands of serials titles, each with a different rate of issue, claiming procedure, binding needs, etc. (5) Acquisitions system. Libraries use vendors or jobbers to buy dozens (hundreds) of copies of books in bulk, possibly before the items are released for sale. A good acquisitions system automates various steps in the process of selecting materials, paying for them, tracking them prior to cataloging, etc. That said, a useful first step would be a system that has (1) a basic idea of a class of items (a catalog record, also referred to as a "title") with searchable metadata for that class. The metadata could possibly be based on the output from the MARC to Dublin Core translator from OCLC (http://alcme.oclc.org/marc2dc/) (2) an OPAC with a pretty interface (see http://sunsite.berkeley.edu/Libweb/ for every web interface known to mankind) that can search the catalog records with some indication of item availability. (3) inventory tracking for individual items. The ability to assign an item to a specific user (ckeck it out) for a specified period (loan period). The availability of items for circulation should be reflected in the OPAC. (4) a patron system so that items can be checked out to a specific user. Of course, ZOPE and CMF already have powerful user mechanisms available. I will finally get to Joachim Schmitz's last question: how is an ILS related to ISIS? In 1967, the United States Library of Congress (LC), with the help of industry experts developed the MARC format for machine readable bibliographic data. I was trained as a librarian in the United States and have not had much exposure to ISIS, so see http://www.unesco.org/webworld/isis/art1999_unimarc.htm for an article on MARC and ISIS. But, it appears that the MARC format is essentially a standardized ISIS Field Definition Table (FDT). Here is some more information on some ILS components (long). MARC format (bibliographic). Today MARC is used as a data exchange format. Official formats are still promulgated by LC (see MARC Lite at http://www.loc.gov/marc/bibliographic/lite/) Most, if not all, ILS break the MARC elements into their constituent components and map them onto a relational database. If they need to send a record to OCLC (http:www.oclc.org), they put all the pieces into a MARC record and send it off. MARC also provides the structure upon which we hang an elaborate set of cataloging rules, the Anglo-American Cataloguing Rules, 2nd ed. (AACR2). The AACR2 is a multi-volume set that sets out what information goes into a MARC field (tag) and subfield. Here is an example from http://130.15.161.74/techserv/cat/Sect02/c02a2.html Tag 245 -- Title of the Work "Transcribe the title proper exactly as to wording, order, and spelling, but not necessarily as to punctuation and capitalization"--1.1B1. "If the title proper is not taken from the chief source of information, give the source of the title in a note"--1.1B1. Parallel titles Parallel titles are titles in other languages "Transcribe parallel titles in the order indicated by their sequence on, or by the layout of, the chief source of information."--1.1D1. For example: 245:10: |a Wood Cree = |b Les cris des forets You can even go one step further with the rules with The Library of Congress Rule Interpretations, which give examples and descriptions of how LC interpret the rules. All of this is to get consistent information in a catalog system. There are also MARC formats for holdings (used in a circulation system) and other types of information. Circulation System: At heart, a circulation system is an inventory tracking system. Reports and statistics are very important. Libraries generally do not generate revenue. They must justify their existence by their service to the community. We generally do this by showing tons of statistics related to the amount of circulation, circulation per item, circulation per capita, etc. Circulation is the capital by which libraries measure themselves. (I'll now start using the abbreviation "circ" in library jargon as both a noun and a verb to describe various aspects of circulation systems) Most circ systems allow for renewals (counted as more circ) with a limit of 2 or 3 renewals. Libraries do not charge fines to make money. They charge fines to get the materials back so they can continue to circ. So, a good circulation system includes automated letters and reports alerting patrons of overdue materials and fines. Since some people eventually pay fines, there should be some cash drawer capability (hopefully with some type of interface to the back-end accounting system) Reserve/Request None of the Open Source library projects (see http://www.oss4lib.org) have a request/reserve system (also known as booking or hold systems). I work for several years at a large metropolitan library system with a locally developed library. Development ended about 5 years ago, but the system is still in use, while the library chooses a commercial ILS. The local system has no web interface and was a bear to tweak (coded in RPG on an IBM AS/400). However, not even the commercial vendors have shown as an efficient and flexible reserve/request system. A reserve is a patron order for a title with no copies (items) currently available for circulation. From the OPAC, the patron places the order. When a copy of the title is discharged (checked in) at any of the 40+ library branches, a routing slip is generated and the items is shipped to the patron's "pick-up location". When the item arrives at the pick-up location, it is scanned and made available to the patron (on the "reserve shelf"). A post card is generated overnight alerting the patron that the item is waiting at the pick-up location. A request is more proactive than a reserve. The patron searches the OPAC and discovers that some copies of the desired title are available, but not at the location in which the search was performed (requests are also available for internet and dial-in patrons). Based on the patron's pick-up location and on item availabilty, the system places the order on a branch's "request list". The determination of the branch is based on the branch's location in the library's truck routes. It is possible that a request will be filled at one branch and the pick-up location is only 1, 2, or 3 stops away on the truck route. Requests can be filled in as little as half a day and at most two days (if no items are available in the preceding route segment, the items is shipped from any available branch to the central library and then back out to the pick-up location). Twice a day, staff print out their request list, pull the items, and ship them to the pick-up location. Notification is then the same as for reserves. Authority Control Authority Control is another advanced feature only available in the very expensive ILS. This is a completely inadequate explanation, but here goes. Unfortunately, all of the people in the history of the world who have produced intellectual output worthy of cataloging have not made things as tidy as librarians would like. For example, a woman writes several books prior to her marriage. She changes her name and writes several more books. We want a search for either of her names to return ALL of the books written by her, regardless of what her name was at the time or what it is now. This is where name authority comes in. There is a MARC standard for authority records. Through some type of magic (I am not a cataloger and I don't understand well how authority control works), the bibliographic MARC records are related to the authority MARC records and the OPAC gives the proper list of items. (Of course there are more exotic examples of pseudonyms and name changes brought on by gender changes, but you get the idea). There is also the idea of subject authority control. For example, the preferred subject heading (in the Library of Congress Subject Headings) for "Areoplane" became "Airplane". We want to return all records for the proper subject heading regardless of what term was used at the time the item was originally cataloged. This is subject authority control. Because authority information is constantly changing, big libraries subscribe to a service, which sends them authority records (via tape or Internet) that must be overlaid onto the running system. There are many other aspects of library automation that have not generally been "integrated" into the commercial ILS. These include patron portals, inter-library loan, reader services, and automatic login and interface to online resources. These features have been left to the resources of in-house programmers and staff. Of course, Zope is perfect for many of these functions and is probably used at some libraries already. Thanks for listening, --Tim Chase Other resources: University cataloging department manual - http://bullpup.lib.unca.edu/tsproced/cat/CatMan/Default.htm Big name ILS vendors - http://www.sdln.net/about/ils-vendors.html Library Automation vendors (including smaller libraries) - http://libinfo.com/vendors-systems.html

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