The IBM Workplace Forms product suite will make your life easier. It simplifies by an order of magnitude the work of creating and maintaining forms applications.
Sometimes I hear people say "Forms. Hey, name, address, pepperoni, extra cheese. I know about forms. Nothing new there." Well, guess again because we're not talking about those kind of forms. After all, hey, you do already know all about those kind of forms.
In this blog, I'd like to be able to talk to you, the developers in our community, about what makes IBM Workplace Forms different and better for forms applications. We'll talk about bigger picture trends, architectures and models, but in at least equal measure we'll talk about the nitty gritty, the pointy brackets, the XForms, the XML and other technologies behind it all. And best of all through our dialogue we'll develop a community of the most efficient and effective forms application developers on the planet.
For now, let's start with some links you can use to get your hands on some software to test drive.
Here are the reference manuals and user docs for the currently released version:
Now, for me, here's the really exciting link. Our upcoming new version will be available in 26 languages and combines rich XML processing capabilities of XForms with the precision presentation, rich user experience and superior authoring experience of Workplace Forms.
Here's a link to the current public beta:
(This is the Lotus main beta page. The direct link is http://www.lotus.com/ldd/beta/workplaceformsbeta.nsf/)
Smarter Everyone, Smarter Everything, Smarter Everywhere
John M. Boyer 060000VMNY 1,183 Views
John M. Boyer 060000VMNY 1,311 Views
Got a request today to provide more specific information on exactly where to find the XFDL reference manual.
The documentation site link in my prior post includes a link to the currently released XFDL Reference Manual. For ease of use, the following appears to be the specific link on that documentation site:
Note that you will ultimately receive the XFDL reference manual in PDF; we always publish our language manual in PDF because PDF is good at static readonly documents. XFDL is good at dynamic interactive precision forms applications, but that doesn't mean the language manual should be expressed in it.
On a separate note, you can find a fairly comprehensive technical introduction to the integration between XFDL and XForms in my XML 2005 conference paper. The upcoming version of IBM(R) Workplace Forms(tm) will be accompanied by an updated reference manual that describes the union of XFDL and XForms exhaustively, but at 36 pages, the conference paper actually gives quite a thorough start to those interested in the pointy brackets. Here's the link:
I did a customer site visit out in Washingto DC earlier this week (I live on the west coast of Canada). On the plane next to me there was a guy who had a book to read with a title that was something like "Three men, a raft and the most dangerous river". It appeared to be about three guys who navigated the Amazon in a raft.
Perhaps it was just my mood at the time, but it struck me as a little ironic to read a book about it. It's just so much the kind of thing you have to do.
Well, while we're in the land of giant leaps... forms applications are like that too. You can read, but you have to *do* too.
For my own case, the Workplace Forms beta download is accompanied by a reasonably substantial sample form that I wrote to help illustrate for you a number of the important features that are available, such as a wizard-like or guided-interview modality attached to the front end of a "traditional" form.
The internal markup is highly commented and laid out so that you can really get an understanding at the pointy bracket level even if you only have a text editor for exploration (though the beta also includes our eclipse-based designer product).
So, speaking of doing (and also to fulfill my promise to talk about the nitty gritty), it seemed a good idea to share with you one of the interesting things I learned from this form.
The typical form is designed to be used in a particular business context. In general, you will not find that a form (of the size and scope that Workplace Forms targets) is easily purposed to serve multiple locales or business contexts. The "mortgage preapproval" sample form was created to give people in many locales some idea of what the product set can do, but it's not really the intent to address all locale-specific peculiarities. For example, a more realistic form in Russian would have the formulae and inputs adjusted to collect monthly salary information rather than yearly information. And in some locales, it isn't even appropriate to collect interest on a loan, nor is it appropriate to accept a service like a loan for free, so interest is something that is informally negotiated rather than being driven by an exact compound interest formula.
Anyway, as I said we just wanted to provide a form that would give a good idea, so we ended up with the task of translating the form to many languages.
Something I didn't expect happened because I put some localizable strings into certain XML attributes, like an XForms calculate or the value attribute of an xforms:setvalue. The word "Electricity" becomes "L'Electricitie" (pardon my omission of accented characters).
The addition of the apostrophe is problematic when in an attribute because the attribute contains an XPath expression. So you have double quotes around the attribute value, so that single quotes are used around the literal value, and the apostrophe conflicts with that. Moreover, the apos character entity is of no help because that is an encoding consumed by the XML parser, not the XPath parser, so it is converted from a character entity to the literal character by the XML parser so that the XPath parser still receives the offending character.
So, it seems forms have to be designed so that strings intended for humans don't appear in XML attributes that contain XPath expressions. My apologies to my European friends, who no doubt know this already. As I said, pardon my French.
John M. Boyer 060000VMNY 1,388 Views
Very soon, I'll be heading off to the W3C Technical Plenary.
Sure, it's in Cannes, but it's also in February, so it's all business.
This is a time when many W3C working groups congregate in order to have time to have intergroup meeting times. So, the XForms working group will have its face-to-face meeting later in the week, but so will a dozen or more other groups. Similarly, the compound document format group chaired by Kevin Kelly will meet earlier in the week. I plan to sit in on some of that as an observer and to talk as needed about the intersection of XForms and compound document formats.
The mid-day of the plenary is a time for common presentations, one of which is a panel presentation called "Rich Web Application Backplane". Kevin is the chair of the panel, which has a number of panelists including yours truly.
The panel is basically about the notion that we have lots of rich XML processing capabilities available now, expressed as XML. This allows for compound documents that are capable of aggregating the data, views, rich user experience, and web services needed to complete a sophisticated web application transaction.
While some further work can be done to do a better job of creating more seamless integration of various components in the W3C stack, a lot of the foundational technologies are already there and in pretty good shape, so herewith is the rallying call to pull them together into an XML backplane capable of supporting the design of rich web applications.
One of the things I really like is the potential for XML events to be the glue that binds together nicely modularized XML technologies into an effective, intelligent compound document. I think an update to XML events would be useful to add certain key features, but even as-is the capture and bubble phases combined with event context have allowed me to express an integration of XML signatures into a compound document format that includes XForms and a first class presentation language (XFDL, of course).
Of course, whenever we talk about advancing the conceptual model of the web in some way, we get a certain amount of feedback about whether we are talking about evolutionary change or revolutionary change. The latter causes IT folks ot go weak in the knees over deployment issues, so branding something revolutionary is really about trying to stop it from happening.
This means that you can have a staged migration to a rich native client that directly runs the high level language because the conceptual model expressed by the language can be delivered, with few limitations, to today's client platforms-- zero footprint.
In the IBM Workplace Forms space, we call the native client "Viewer" and we call the zero-footprint version "WebForm Server". The idea is that you design an XFDL form containing precision presentation, rich user experience and business logic/dynamic interactive capabilities using XForms within the XFDL. Then, you deliver it using one of these two interactive rendition engines.
A demo of this capability is how my panel segment will end. After all, nothing trumps being able to show some of the kinds of capabilities that would be enabled by the rich web application architecture.
John M. Boyer 060000VMNY 1,245 Views
Well, it's only two days into the W3C Tech Plenary and already I have enough things to write about that I cannot possibly inflict it all upon you in one blog entry. So, I'm just going to give an overview so that I'll remember to talk about some of this stuff in more detail later.
But first, an excellent bit of humour from another long-time W3C member who also happens to live in Canada (a little knowledge of Canadian geography and politics helps with this one):
Liam: Where do you live?
John: I live in Victoria, which is near Vancouver.
Liam: Oh, I live in Ontario, which is near Toronto.
Well, it was funny when Liam said it :-)
Anyway, for the first two days here I have been able to sit as observer on other working groups as well as have some individual discussions of some importance. Here is a summary:
The chat with Liam also included his hopes for XForms eventually adopting XPath 2.0. More about this in another blog entry...
Sat in for a while on the Compound Document Formats working group. Major topic of discussion was event flow between DOMs. How do a parent and child document come to agreement on whether events flow between them? Where does the capture phase start? More to come...
Sat in on the XHTML working group. Major topic: XML events. Specifically, how to upgrade XML events to offfer authors the ability to dynamically add and delete listeners after the document is first loaded. There's not a lot of complexity semantically, but the discussion of the vocabulary involved led to a very exciting discussion about the meaning of namespaces, especially as applied to attributes. This will be a beaut of a blog entry...
Talked with Doug Schepers, who was very interested in having a declarative way of doing AJAX-like things so that the functionality could be securely enabled even with scripting off. I told him I would demo it tomorrow in my part of the Rich Web Application Backplane panel. It's called XForms. More to come...
Finally, had a very good chat with Jose Kahan and Thomas Roessler about making progress on correcting the impedance mismatch between canonicalization and xml:id, with implications for a revision of XML Signatures. Lots more to come...
Stay tuned for more on these points!
John M. Boyer 060000VMNY 1,146 Views
A lightning talk at the tech plenary is about 3 minutes long and introduces something very specific to the W3C.
I gave a lightning talk on the effecs of adding or changing the stuff in a namespace. You can see the diagram and notes here: http://www.w3.org/2006/03/01-Boyer-Lightning/SignaturesAndNamespaces_Boyer.html
Basically, got a lot of nods all the way up to TimBL himself when I said you either have to use a new namespace, or you have to internally version the language so that old processors for a vocabulary don't try to render new documents with graceful degradation of unrecognized content when the documents have been signed.
Too bad this is exactly what happened with xml:id. It got added to the XML namespace rather than some other namespace, and the version of XML didn't change. Lo' and behold, it broke something. When doing a C14N of a document subset containing orphaned nodes, C14N copies XML namespaced attributes into orphaned nodes when they don't contain their own settings for the nodes.
This is good for xml:space, xml:lang and xml:base, but it isn't good for xml:id.
Truth be told, it's kind of an edge case. In XFDL, we don't even allow you to orphan nodes when signature filtering because the structure of the language is such that an orphaned node is useless without its ancestral chain.
Still, while the problem doesn't affect Workplace Forms, we (in W3C capacity) will still endeavor to fix the problem.
Since the ship has already saled on what namespace xml:id lives in, we're going to be doing a new C14N algorithm that doesn't do the inheritance behavior on xml:id OR one that doesn't do the inheritance behavior except for lang, space and base.
Actually, it's a little more complicated than that, since either of the above choices means that C14N will again be broken in the future when either a non-heritable or a heritable attribute, respectively, is added to the XML namespace.
I think we may have to add a parameterization to the new C14N that allows the author to specify the heritable attributes. This will allow document authors to keep up with adjustments to the XML namespace.
The core WG feels that further additions to the XML namespace are highly unlikely, but I'm not convinced. Just at this tech plenary alone, I heard calls for xml:role (like HTML's role) and xml:profile (like DOM's hasFeature, it would declare that a document has a feature so the processor needs to have the feature or the document won't work). In the past, I've heard a need for xml:src (like HTML src, except HTML's default is wrong-- content should override the attribute rather than the reverse). And my personal fave would be xml:compute to express that the content of an element is computationally derived from other content. The list really does go on once you start to think about XML as an intelligent object...
John M. Boyer 060000VMNY 866 Views
XForms 1.0 Second Edition has been published today at http://www.w3.org/TR/xforms/
To get an idea of the quality and quantity of improvements made to XForms, please see http://www.w3.org/2003/10/REC-xforms-10-20031014-errata.html
Based on this improved foundation, the XForms working group will now be focusing its energies on the completion of XForms 1.1. To get an idea of what will be available, check here: http://www.w3.org/TR/xforms11/
The one comment I would make about the above working draft is that the we will almost certainly revert to using the same namespace currently used for XForms 1.0, and instead use some mechanism within the language to do versioning.
In keeping with my prior post about signatures and namespaces, it is important to version a language either internally or by updating the namespace URI. Previously, we chose the namespace route because XForms is designed to be hosted within another language, so it has no root element of its own to which a version could be attached.
However, XForms 1.1 is using some special schema wizardry that allows it to have a "chameleon" namespace, which will make it easier to import XForms into a host language like XHTML without namespace qualification. I'm not a big fan of doing this, especially for host languages other than XHTML because it becomes harder to find the XForms within another document and host the XForms functionality separately from the original host language.
Nonetheless, the feature is there and it occurred to me during the W3C tech plenary that the chameleon namespace could be used to put XForms 1.1 back into the XForms 1.0 namespace. That means that XForms processors trying to determine what semantics to attach to the vocabulary need some other way to make their decisions. So we simply have to solve the versioning problem without using a change of namespace URI.
The camp that wanted us not to change namespaces will be happy. My own XSLTs will be happy too.[Read More]
Well, no blogs from me next week, so seems a good idea to knock off another one this week...
XML namespaces rec (pardon the pun) states that an attribute which is namespace unqualified is 'local' to an element and is uniquely identified by a combination of the attribute local name and the type and namespace URI of the containing element.
The word identify really should be used more sparingly, as here is a case where its misuse has caused years of confusion and acrimony in the XML community. An identifier is something that established the identity of something else. You cannot have two things associated with the same identifier unless they are identical things.
I am often frustrated by seasoned W3C folks who say that "this depends on your definition of identify" and honestly believe this is a defense of the confusion in the namespaces rec. This is like saying ot me, "Well you're right unless you have a definition for identify that doesn't identify things, which is what we did at the W3C."
To see the problem, you have to look earlier in the spec where a namespace n1 is associated with a URI and then the following code appears:
<good a="1" n1:a="2" />
The problem is that the element 'good' is in the same namespace as n1. So now you have local attribute a that is essentially given meaning by an element that is in the same namespaces as the 'global' attribute n1:a. Yes the two attributes have different values.
From this we have to infer that, although a local attribute is given meaning based on the containing element and its namespace, a global attribute with the same local name and namespace qualified into the same namespace can actually mean something totally different..
In other words, we have two attributes with the same local name, contained by the same element, and given meaning by the same namespace URI, but they are not identical. This is the local attribute not being 'identified' (in my sense) by local name and containing element type and namespace.
The technically subtle W3Cer will tell you that there was no reason to spell out using words in the normative part of the spec the fact that the two attributes are different things because the spec says that local attributes are in a different partition than global ones. Problem is, this partitioning info is in a non-normative part of the spec, and particularly in the same part that has the language about how local attributes are 'identified' by local name and containing element type and namespace.
Anyway, the upshot is that an XML vocabulary does not need to but is allowed to say that local and global attributes with the same local name can mean different things. If they're supposed to mean the same thing, then the XML language has to define a precedence rule for what happens if the two attributes differ in value. Here's an example:
Question: Is the price in USD or Euros?
Answer: Depends on who designed the language.
Second answer: Don't do that.
Interestingly, the XHTML working group came up with a fascinating example where it is legitimate and sensible to have a global and local attribute with the same local name but completely different meanings. It has to do with the next version of XML events. After hours of discussion, the decision was that they weren't going to do that (second answer above). Not because it's illegal, but because it's too subtle for most XML people.
Well, the XHTML group may change their minds, but even if they don't, the example is really worth understanding because it actually makes sense why you'd want to have the two attributes mean something different. Stay tuned, I'll tell you all about it when I get back...[Read More]
John M. Boyer 060000VMNY 1,771 Views
Continuing from the last post, here is a reasonable use case for having a global (namespace qualified) attribute with the same local name as a local (unqualified) attribute, where the attributes do not have the same meaning and the global attribute is in the same namespace as the containing element.
The current version of XML Events allows you to declare a listener for an event on a node. There are multiple ways to do this, but the easiest is to use a global attribute in the events namespace (signified by the prefix ev below):
An xforms:trigger can be represented, for example, by a button widget, and pressing the button results in a DOMActivate event on the trigger.
The ev:event declares the name of the event to listen for, and the default value for ev:target (when it's not specified) is the parent element of the one containing the ev:event. So, the above declaration causes a listener to be created for the occurrence of the DOMActivate on the trigger. The handler for the event is given by the content of the xforms:action that bears the ev:event. An example of an action to be performed would be inserting a node of data (which would likely correspond to adding a row to a repeat table).
All of this is just plain vanilla XForms so far. But at the W3C tech plenary, the XHTML working group began discussing upgrades to XML events. The reason is that the current version of XML events declares listeners that are created at the moment when the DOM node being listened to is created. There's no way to create a listener later in the life time of a document, possibly contingent on some condition or the occurrence of some event.
Syntax for this could look something like this:
In this example, ev:listener is an action handler for the DOMActivate event that happens on the trigger. So when you activate the trigger (press the button), a listener for event Y is created on the node with id="X".
The local, namespace unqualified attribute 'event' tells the event that the listener will listen for. The global, namespace qualified event 'ev:event' tells the event whose occurrence causes the ev:listener action to be performed.
This is a very neat and compelling example where a local attribute (event) which is given meaning by a namespace (XML Events) might legitimately have a completely different meaning than a global attribute with the same local name and same namespace as the containing element (ev:event).
Although the XHTML working group quite liked this solution, they had a lengthy discussiona and concluded that this aspect of XML namespaces is not understood well enough to rely on the feature without confusing document authors. Of course, they are free to change their minds later, I would say that the above syntax is not likely to see the light of day in a W3C recommendation.
That's why I'm blogging it. Because even if it goes away, we still need to try to increase understanding of this aspect of namespaces and attributes, and nothing does that better than a good example, and this is the first one I've seen.
And we can thank Steven Pemberton for it![Read More]
John M. Boyer 060000VMNY 1,259 Views
IBM is interested in all manner of open standards, including XForms, because they allow organizations to express their information assets in a format that can more easily be preserved as one incorporates more technologies into an application over time to meet evolving business requirements.
As Kevin Kelley (STSM, emerging standards) explained in a telecon this morning, the standards are like an on-ramp that allows assets to be developed over time. If you care about reuse of those assets, then you care about standards.
To be honest, this is the same argument that drove XML to the ubiquity it currently enjoys. With XML, we sought to standardize how data models are expressed. With XForms, we seek to standardize the expression of processing models over that data.
Some upcoming posts:
1) What does XForms actually offer?
2) How does XFDL fit into the above open standards story?
3) What makes XFDL+XForms an ideal format for archival, transaction auditabilty, and transaction security purposes?