[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Word of the day: upconversion
Hi Folks, Recently I read an article [1] by Michael Kay and learned a fabulous word: upconversion The word originates in the broadcasting industry, where it is used to mean the conversion of a low resolution image to an equivalent high resolution image. In the XML world, the word refers to taking unstructured text and adding structure (markup) to create a richer, structured document. Here's how Michael Kay describes it: Upconversion is the generation of a format with detailed markup from a format with less-detailed or no markup, where it is necessary to generate the additional markup by recognizing structural patterns that are implicit in the textual content itself. EXAMPLE #1 Upconvert this fixed-field, comma-separated text: Origin of Wealth, Eric D. Beinhocker, 2006, 1-57851-777-X, Harvard Business School Press to this XML format: <Book> <Title>Origin of Wealth</Title> <Author>Eric D. Beinhocker</Author> <Date>2006</Date> <ISBN>1-57851-777-X</ISBN> <Publisher>Harvard Business School Press</Publisher> </Book> EXAMPLE #2 Upconvert this prose: Level 1 managers may sign off on purchase requests that do not exceed $10K. to XML by mapping nouns to markup and adjectives to data: <Request id="purchase"> <signoff manager="level1" LE="10000" /> </Datatype> QUESTION Consider the spectrum from random text to well-designed XML: <-------------------------------------------------> random XML upconversion ---------> Suppose we place prose somewhere between random text and XML: <-------------------------------------------------> random prose XML upconversion ---------> Where would you place XPath? For example, consider these three ways of expressing a business rule: (a) Prose Level 1 managers may sign off on purchase requests that do not exceed $10K. (b) XPath not(purchase-request[number(cost) gt 10000]) (c) XML <Request id="purchase"> <signoff manager="level1" LE="10000" /> </Datatype> Where would you place the XPath expression in this spectrum: <-------------------------------------------------> random prose XML upconversion ---------> Would you place it close to the XML side? Would you place it close to the random side? Would you place it to the left of prose? Would you place it to the right of prose? /Roger [1] http://www.saxonica.com/papers/ideadb-1.1/mhk-paper.xml
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