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I've thought about/messed with this stuff before, and come up with no good elegant solution. It is indeed kind of a mess. On 2/24/2011 12:03 PM, Robert Sanderson wrote: > That is (still) incorrect. > > A single schema may contain multiple namespaces, and there isn't a > unique identifier for a schema. For example, any simple Dublin Core > based syntax must have at least two Namespaces, Dublin Core and the > wrapper element. SchemaLocation is not unique as there can be many > copies of the same schema. A single schema may define multiple root > elements, such as MODS does with both item and collection level > elements. > > Referring to your blog post, you can say how the four inter-relate: > > Schema Identifier uniquely identifies the format. > Schema Location is a non-unique description of the format. > Schema Name is a short, human readable, non-unique name for the format > and Namespace is a non-unique namespace used by the format. > > This is just a rehash of a previous discussion on this list, between us: > > http:[log in to unmask] > > So I guess I'm wasting my time ;) > > Rob Sanderson > > On Thu, Feb 24, 2011 at 9:44 AM, Jakob Voss<[log in to unmask]> wrote: >> Hi, >> >> We are developing a general API management tool to provide different APIs >> (unAPI, SRU, OAI-PMH...) with different record formats (MARC, MODS, DC...) >> to our databases. We now stumbled upon some confusion regarding XML formats. >> The basic question is "what is a format and how do you refer to it?" >> >> I came to the conclusion that at least SRU schema identifiers are useless. >> In addition you can extract XML namespace URIs from XML Schemas, so all you >> need to identify a format is a link to its XML Schema. >> >> I wrote a more detailed blog posting about this at >> http://jakoblog.de/2011/02/24/xml-schema-vs-library-apis-oai-pmhsruunapi/ >> >> Does anyone of you relies on SRU schema identifiers when consuming SRU? >> I think at least for XML-based formats we should only use the XML Schema as >> authoritative reference. Sure there are different applications of variants >> of one schema, but then it makes no sense to use global identifiers in >> addition to local names. >> >> Jakob >> >> -- >> Jakob Voß<[log in to unmask]>, skype: nichtich >> Verbundzentrale des GBV (VZG) / Common Library Network >> Platz der Goettinger Sieben 1, 37073 Göttingen, Germany >> +49 (0)551 39-10242, http://www.gbv.de >>