Challenges: Some Ugly Truths
The challenges of building—and living with—an XML workflow are clear enough. The return on investment is a long-term proposition.
Regardless of the benefits XML may provide, the starting reality is that it represents a very different way of doing things than the one we are familiar with. The Word Processing and Desktop Publishing paradigm, based on the promise of onscreen, WYSIWYG layout, is so dominant as to be practically inescapable. It has proven really hard to get from here to there, no matter how attractive XML might be on paper.
A considerable amount of organizational effort and labour must be expended up front in order to realize the benefits. This is why XML is often referred to as an “investment”: you sink a bunch of time and money up front, and realize the benefits—greater flexibility, multiple output options, searching and indexing, and general futureproofing—later, over the long haul. It is not a short-term return proposition.
And, of course, the returns you are able to realize from your XML investment are commensurate with what you put in up front: fine-grained, semantically rich tagging is going to give you more potential for searchability and recombination than a looser, more general-purpose approach, but it sure costs more. For instance, the Text Encoding Initiative (TEI) is the grand example of pouring enormous amounts of energy into the up-front tagging, with a very open-ended set of possibilities down the line. TEI helpfully defines a level to which most of us do not have to aspire.[5]
But understanding this on a theoretical level is only part of the challenge. There are many practical issues that must be addressed. Software and labour are two of the most critical. How do you get the content into XML in the first place? Unfortunately, despite two decades of people doing SGML and XML, this remains an ugly question.
Gary Edwards on 06 Jun 08Although there are many ways to slice this discussion, it might be useful to compare Adobe RIA and Microsoft Silverlight RIA in terms of web ready, highly interactive documents. The Adobe RIA story is quite different from that of Silverlight. Both however exploit the shortcomings of browsers; shortcomings that are in large part, i think, due to the disconnect the browser community has had with the W3C. The W3C forked off the HTML-CSS path, putting the bulk of their attention into XML, RDF and the Semantic Web. The web developer community stayed the course, pushing the HTML-CSS envelope with JavaScript and some rather stunning CSS magic. Adobe seems to have picked up the HTML-CSS-Javascript trail with a Microsoft innovation to take advantage of browser cache, DHTML (Dynamic HTML). DHTML morphs into AJAX, (which so wild as to have difficulty scaling). And AJAX gets tamed by an Adobe-Apple sponsored WebKit. Most people see WebKit as a browser specific layout engine, and compare it to the IE and Gecko on those terms. I would argue however that WebKit is both a document model and, a document format. For sure it's a framework for very advanced HTML-CSS-DOM-Javascript work. Because the Adobe AIR run-time is based on WebKit layout, WebKit documents can hit on all cylinders across any browser able to implement the AIR plug-in. Meaning, web developers and web content providers need only target the WebKit document model to attain the interactive access ubiquity all seek. Very cool. Let me also add that the WebKit HTML-CSS-DOM-Javascript model is capable of "fixed/flow" representation. I'll explain the importance of "fixed/flow" un momento, but think about how iPhone renders a web page and you'll understand the "flow" side of this equation.
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