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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Can schema stand alone?
 Hi all, I'm pretty new to XML and have only been reading this list a few days, so please forgive me if this seems like a really stupid question... I am investigating XML as a data-transport solution for what are, in essence, "sparse" databases. One of my requirements is that the mechanism used must be able to stand alone -- i.e. I have to be able to deliver an ISO9660 CD and the XML on it would have to be complete in the absence of an internet connection. Often our data will be accessed over an intranet or the internet, but we also must maintain the capability to operate in the absence of both. From what I've seen so far DTD would work perfectly, but I get the feeling after reading this list and other sources that DTD is "on the skids" and likely to become obsolete and that Schema is generally considered the future -- if that is not correct, please let me know as I can quite happily implement this in DTD! I've been reading up on schemas and every example I've seen so far starts by referencing the schema namespace at w3c.org (i.e. <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">). Is this required for schemas to operate? If so, it seems to conflict with my requirement that the data be complete and usable even without access to the internet. (It also seems that a lot of developers must be really sticking their necks out on something that they have absolutely no control over, i.e. that W3C won't change or move the namespace definition. I used to do risk analysis for DOD software development and this scenario would have had us passing out by the numbers.) Does the schema syntax stand alone in the absence of the xs namespace reference? I.e. would it be possible (and reasonable) to define my own namespace (something like <myschema:schema xmlns:myschema="my_local_file_reference">) and to NOT reference the xs namespace at all? Can you describe, in a nutshell, the perceived advantage that Schema has over DTD? Finally, if you could own only one reference on XML, suitable for experienced software developers who are new to XML, what would it be? Thanks, John Atchley Senior Software Analyst Engineering and Design, Courseware Support FlightSafety International, Inc. mailto:John.Atchley@F... 
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