Cart
|
[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: In converting XML instance A to XML instance B, this prope
 At 2013-11-29 15:09 +0000, Costello, Roger L. wrote: This hex string is the EBCDIC encoding of the uppercase letter A:No, the program has been instructed to interpret C1 as EBCDIC and to put out ASCII. There is nothing about the hexadecimal value C1 that says it is the EBCDIC letter A. I might just as well say "C1" is z http://www.fileformat.info/info/unicode/char/00c1/index.htm Next, consider this XML which expresses the location of Bostons Logan airport, using an ICAO code:That label is pretty convincing in leading me to interpret the string as an airport code ... but it is just a labelled piece of text. The label tells me how the sender intended the recipient to interpret it. But what if I ask myself "which airport codes are also FM radio stations?" Then I'll get this answer: http://www.radio-locator.com/info/KBOS-FM I chose to interpret the labeled airport code as an FM radio station's call letters, specifically because that was my purpose in interpreting the label ... I was asking myself "which airport codes are also FM ration station call letters?". Just because the sender labels it an airport code doesn't mean I have to interpret it as an airport code ... though for interoperability it would help if I interpreted it as the sender intended. This XML expresses the location of Bostons Logan airport, using latitude/longitude: So the tool is interpreting the labeled content to be an airport code. Fine. The main aspect of the conversion is that the input has a property called semantics its meaning which must be preserved by the process.No ... the sender *wants* the recipient to interpret the labeled content as they intended. For example, the conversion must preserve this semantics: location of Bostons Logan airport.No ... the conversion must choose to implement the semantics "Location of an airport by its code". But wait! Havent we stated that XML doesnt have semantics? Yes, numerous times, and I'm surprised you are bringing this up once again. If XML doesnt have semantics, how can a conversion process preserve semantics?You just said it! XML doesn't have semantics, the conversion process implements semantics. Meaning is in the eye of the beholder. Im confused. I'm surprised you are asking this again. Question: An XML instance document has semantics: (a) Yes (b) No In my opinion: (b) I hope this helps. . . . . . . . . . . . . Ken -- Public XSLT, XSL-FO, UBL & code list classes: Melbourne, AU May 2014 | Contact us for world-wide XML consulting and instructor-led training | Free 5-hour lecture: http://www.CraneSoftwrights.com/links/udemy.htm | Crane Softwrights Ltd. http://www.CraneSoftwrights.com/x/ | G. Ken Holman mailto:gkholman@CraneSoftwrights.com | Google+ profile: https://plus.google.com/116832879756988317389/about | Legal business disclaimers: http://www.CraneSoftwrights.com/legal | 
[Date Prev] | [Thread Prev] | [Thread Next] | [Date Next] -- [Date Index] | [Thread Index] |
PURCHASE STYLUS STUDIO ONLINE TODAY!Purchasing Stylus Studio from our online shop is Easy, Secure and Value Priced! 
Download The World's Best XML IDE!Accelerate XML development with our award-winning XML IDE - Download a free trial today! Subscribe in XML format
|
|||||||||
