- Zope - Zope lists

XDTML
by Otto Hammersmith 16 Jun '99

16 Jun '99

Okay, here it is... how I think DTML could be represented as XML. The 'var' Tag This tag provides an awful lot of functionality. I think my suggestion would be to deprecate using 'var' as a linking element and create a (or set of) new element(s) based on XLink. The 'if', 'elif', 'else' and 'unless' Tags The problem with 'if', is the way Zope structures it currently- it can't be translated into well formed XML. It looks something like this: <if expr='...'> <elif expr='...'> <else> </if> There are alternatives with various advantages and drawbacks. The first option: <if> Option 1. </if> <elif> Option z. </elif> <else> Default option. </else> The advantage is it's nice and clean. The drawback is using an event based parser makes it a little harder to parse, though not impossible. Another option: <if expr='...'> Option 1. <elif expr='...'> Option 2. </elif> <else> Default option. </else> </if> This is just plain ugly, but it should be easier to parse. I think the best solution is what XSLT uses. The 'if' conditional is limited to a single conditional and a second element ('choose') is defined with syntax similar to C's switch. I don't think there are any severe disadvantages here. They would look like this: <if expr='...'> Optional. </if> and <choose> <when expr='...'> Option 1. </when> <when expr='...'> Option 2. </when> <otherwise> Default option. </otherwise> </choose> The 'unless' tag is simply an 'if' with an implicit negation of the expression. I don't think there is a need for a similar compliment to the 'choose' tag. The 'in' Tag This one is a straight forward conversion. It would look something like this: <in name='employees' sort='name'> ... </in> The 'with' Tag Another straight forward conversion. Some examples from the DTML manual translated to XML. <with name='subfolder'> <var name='title'/> </with> <with expr="_.namespace(profit=price-cost, title=product_name+' summary')"> <h3><var name='title'/></h3> The profit is <var name='profit'/> </with> The 'call' Tag Again a very simple conversion. Here is the example from the manual converted to XML: <call expr="addDocument('hi','display a greeting','Hello world!')"/> As has been mentioned by others, it might be nice to be able to include an entire script in a 'call' element, but that's an entirely different issue. The 'raise' Tag Yet another simple one with a converted example from the book: <raise type="Insufficient funds"> <p>There is not enough money in account <var name='account'> to cover the requested debit amount.</p> </raise> The 'comment' Tag This tag would be obsolete, as the standard XML comment delimiters () are no longer overloaded. It may be worthwhile to provide something similar to xsl:comment, which inserts a comment into the result. The 'tree' Tag The 'tree' tag has the potential to be a complicated conversion. I will make a more significant attempt when I create the first draft of the DTD. One thing I will consider is using XLink/XPointer to replace the header and footer (possibly more) attributes. Here is a conversion of a the simple example given in the DTML manual: <tree> <var name='id'> </tree> Ultimately, it may be best to leave the 'tree' tag as it stands and create a new version that incorporates XLink/XPointer. The 'sendmail' Tag This should be simple as well. Here is a translated example: <var name='standard_html_header'/> <sendmail smtphost="gator.digicool.com"> To: Product Support <<var name='support'/>> From: Web Feedback Form <<var name='feedback'/>> Subject: <var name='subject'/> <var name='body'/> </sendmail> Thank you for your input! <var name='standard_html_footer'/> Other Issues One problem that was brought up was having an output element with an attribute of a dynamic value. For example (in DTML): <a href="<!--#var BASE1>"> (Note, this may not be the best example since the functionality of this code is easily replaced by some kind of XLink support. However, it is easy to envision another case- setting the class attribute, for example.) The easy solution is this: <a href="<var name='BASE1'/>"> This is obviously ugly and hard to write. XSL solves this problem with two new elements, xsl:element and xsl:attribute. If I read the XSLT draft correctly it would look something like this: <a> <xsl:attribute name='href'> <var name='BASE1'/> </xsl:attribute> Contents of the element. </a> What Good Is XML? XML gives us a standard, relatively easy way to programmatically modify a document. This ability makes it trivial to write a document that changes without the intervention of the author. Take, for example, a page hit counter. With current methods counter data must be stored somewhere outside the document. If I move the document I have to manually modify the external data or I loose the current count. What I'd like to do is contain that count in the server side document. A good term might be "server side dynamic documents". This is different than the usual dynamic documents with JavaScript in that processing takes place on the server and changes are universal across clients. This is how I envision the counter example might work. <?xml version='1.0'?> <xdtml:xdtml xmlns:xdtml='...' xmlns:xhtml='...' xmlns:count='...'> <count:hits count='28'/> <xhtml:h1>NiftyTitle</xhtml:h1> <xdtml:call expr='increment("hits")'/> <xhtml:p>This page has been hit <xdtml:var name='hits'> times.</p> </xdtml:xdtml> A couple things that would probably change: 1) The var tag would really be an XLink element pointing to the contents of the hits element for inclusion. 2) The function 'increment' would probably be very different. Ideally, there would be a library of functions designed to mangle XML documents in common ways and, of course, the ability to fall back on a full-blown DOM interface. The traditional counter that covers a whole site could be done with a single document that only holds the counters. Each document that wanted to include that count would simply have an XPointer to another document. Every document that wanted to update the counter would have a line that updated the hits element on that other document. (Note, this can be done currently, I believe.. but the parsing of the DTML is not quite as straightforward.) -Otto.

1 0

ZClasses and SQL Result classes.
by Anthony Baxter 16 Jun '99

16 Jun '99

Is it possible, or going to be possible, to wrap the results of an SQL query in a ZClass instance, rather than a python one? Anthony

2 1

help :( ... entire site disappeared
by Daniel M. Drucker 16 Jun '99

16 Jun '99

I reinstalled Zope2, having saved my var directory to another location. I shut down zope properly before saving that directory. Now, when I put the files from the old 'var' into the new 'var', the new Zope2 doesn't see them and just gives the default view with acl_users, control panel, and standard_*. Have I lost everything? What happened? Why doesn't it recognize my Data.bbb?

1 0

ZORB3 Errors
by J Kinsley 16 Jun '99

16 Jun '99

After posting this error yesterday and getting no reply, I decided to verify that it was not due to something left over from a previous installation. I dumped my entire installation into another directory and untarred Zope-2.0.0a2 into an empty directory. Then did the following: $ python w_pcgi.py $ ./start Upon entering the root manage view, the first thing I noticed was the QuickStart which I had never seen before. I then went to Control_Panel/Database/manage_cacheParameters and no error. Next I tried Control_Panel/Database/manage_cacheGC and again no error. At that point I thought I had solved the problem and backed out to Control_Panel when I noticed there was no restart button. Remembering that the Restart button was part of ZServer, I shutdown the Zope process and went back to look at the start file. There I changed python serve.py to python z2.py and restarted. Now upon entering the root manage view, the first thing I noticed was QuickStart was no longer visible. I proceeded to the Control_Panel/Database/manage_cacheParameters and there was the TypeError exception again. I backed out and tried Control_Panel/Database/manage_cacheCG and again there was the TypeError exception. Here again is the traceback output which is exactly the same for both cases. exceptions.TypeError Traceback (innermost last): File /opt/www/zope/lib/python/ZPublisher/Publish.py, line 255, in publish_module File /opt/www/zope/lib/python/ZPublisher/Publish.py, line 161, in publish File /opt/www/zope/lib/python/ZPublisher/mapply.py, line 154, in mapply (Object: cacheParameters) File /opt/www/zope/lib/python/ZPublisher/Publish.py, line 98, in call_object (Object: cacheParameters) File /opt/www/zope/lib/python/App/special_dtml.py, line 120, in __call__ (Object: cacheParameters) File /opt/www/zope/lib/python/DocumentTemplate/DT_String.py, line 514, in __call__ (Object: cacheParameters) File /opt/www/zope/lib/python/App/CacheManager.py, line 109, in cache_length (Object: Control_Panel) File /opt/www/zope/lib/python/ZODB/DB.py, line 272, in cacheSize TypeError: too many arguments; expected 1, got 2 The problem starts in App/CacheManager in cache_length() where it determines we are not using BoboPOS2 and tries to return db.cacheSize(). When using serve.py, we are using BoboPOS2 and thus the error in ZORB/DB.py is not encountered. At this point, I have no idea how to go about solving the problem. I have looked at the code and cannot immediately find anything wrong with it, but as I stated before, I have only been using Python for a few months so I may be overlooking something. Also, why does QuickStart show up using BoboPOS2 and not with ZORB3? Is anyone else using ZServer and getting these errors or am I the only one who seems to have this problem? Regards, Jarrod Kinsley

3 3

examples of string functions?
by Graham Chiu 16 Jun '99

16 Jun '99

Hi, Just looking for a simple DTML example of how to use the string functions. I wish to check to see if the first and last characters of a sequence-key are a pipe character or not. Thanks, ------- Regards, Graham Chiu gchiu<at>compkarori.co.nz

2 1

2.0.0a[12] Cache Prameters / Flush Cache TypeError
by J Kinsley 16 Jun '99

16 Jun '99

I am getting a strange TypeError in both the 'Cache Parameters' and 'Flush Cache' tabs of the 'control_panel'. I had initially seen this error in 2.0.0a1 back when I first installed Zope (1.x.x never worked because I run Python1.5.2). I had forgotten about it until a little bit ago when I encountered it again in 2.0.0a2. I have searched both the Collector and the list archives and have found no mention of this error, so I am assuming it is restricted to my configuration. Below is the traceback which is exactly the same for both functions. Zope has encountered an error while publishing this resource. exceptions.TypeError Traceback (innermost last): File /opt/www/zope/lib/python/ZPublisher/Publish.py, line 238, in publish_module File /opt/www/zope/lib/python/ZPublisher/Publish.py, line 108, in publish File /opt/www/zope/lib/python/ZPublisher/mapply.py, line 104, in mapply (Object: cacheParameters) File /opt/www/zope/lib/python/ZPublisher/Publish.py, line 97, in call_object (Object: cacheParameters) File /opt/www/zope/lib/python/App/special_dtml.py, line 112, in __call__ (Object: cacheParameters) File /opt/www/zope/lib/python/DocumentTemplate/DT_String.py, line 405, in __call__ (Object: cacheParameters) File /opt/www/zope/lib/python/App/CacheManager.py, line 104, in cache_length (Object: Control_Panel) File /opt/www/zope/lib/python/ZODB/DB.py, line 267, in cacheSize TypeError: too many arguments; expected 1, got 2 I cannot seem to figure out why this is happening from the given information. However, I've only been using Python for two months and Zope for two weeks, so I may be over looking something. System Parameters: Zope-2.0.0a2 Python-1.5.2 RedHat-6.0 Linux-2.2.9 Regards, Jarrod Kinsley

2 1

Redirects
by Phil Grove 16 Jun '99

16 Jun '99

Hello all, Can anybody tell me if it is poosible to specify a target frame in a redirect command?? Cheers, P. --------------------------------------------------------------------- Phil Grove phil.grove(a)flg21.com Web Development 0113 2949494 flg21 http://www.flg21.com ---------------------------------------------------------------------

3 2

RE: [Zope] FTP and apache?
by Michel Pelletier 16 Jun '99

16 Jun '99

> -----Original Message----- > From: Daniel M. Drucker [mailto:dmd@3e.org] > Sent: Wednesday, June 16, 1999 2:43 PM > To: Zope List > Subject: [Zope] FTP and apache? > > > > I'm using Zope 2 (a2) + apache, on port 9673. FTP starts up fine on > port 9221 if I use ZServer, but if I use apache (I'm using the > prebuilt Zap, copied from my Zope1 installation) FTP doesn't start up. > What might I be doing wrong? > Apache is not an FTP server. If you don't run ZServer, there is no process to listen on port 9221. Zope does not listen on ports, the servers that use Zope do. If you want to run Apache as your HTTP server, and ZServer as your FTP server (and whatever else) use ZServer with PCGI. -Michel > dmd > > > _______________________________________________ > Zope maillist - Zope(a)zope.org > http://www.zope.org/mailman/listinfo/zope > > (For developer-specific issues, use the companion list, > zope-dev(a)zope.org - http://www.zope.org/mailman/listinfo/zope-dev ) >

2 1

FTP and apache?
by Daniel M. Drucker 16 Jun '99

16 Jun '99

I'm using Zope 2 (a2) + apache, on port 9673. FTP starts up fine on port 9221 if I use ZServer, but if I use apache (I'm using the prebuilt Zap, copied from my Zope1 installation) FTP doesn't start up. What might I be doing wrong? dmd

1 0

ZODB3 question
by Jimmie Houchin 16 Jun '99

16 Jun '99

>From thread: RE: [Zope] Large Portal requirements (was: Other web servers?) At 03:15 PM 6/14/99 -0400, Michel wrote: >In the future, we will be have the client server model of ZODB3 (which >will be a commercial product) that lets you have multiple Zope frontend >processes (possibly on different machines) accessing multiple database >backend processes (possibly on different machines). Also, ZServer is >currently multi-threaded, but there is no theoretical limitation to >making it multi-process, in which each Zope instance will have it's own >Python and thus it's own global Python lock, thus giving the OS the >ability to schedule multiple processes among multiple processors, a >little heavier than threads on multi-processor, but *vastly* easier to >impliment and far more stable. And then... >From thread: RE: [Zope] How stable is the 2.0 alpha release? At 11:12 AM 6/16/99 -0400, Michel wrote: >Yes, 2.0 alpha will work fine with an existing Database *if* you run it >in ZODB2 mode (no concurrency). If you run it in ZODB3 mode (the >default) your Data.bbb file will not even be used, rather, a different >file called Data.fs (fs = File Storage, remember, ZODB3 can use multiple >backend stores) will be used. Data.fs and Data.bbb are two different >formats, and are incompatable. Real Soon Now we will have a conversion >script to upgrade from Data.bbb format to Data.fs format, but I for one, >will promise no date. To clarify my understanding. Will their be a non client-server version of ZODB3 which offers concurrency that will be a part of the non-commercial, open source part of Zope? Jimmie Houchin

2 1