[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: DTDs don't have ID or IDREF elements so why does XMLSchema
On 01/03/2022 23:52, Michael Kay wrote: Orthogonality, or to put it another way, avoiding arbitrary restrictions. If ID and IDREF are going to be among your set of data types, then why would you want to disallow people from using them on elements.It's part of the way some people view XML. I struggle to find any use case for using ID or IDREF on elements. In fact, I would argue that adding an ID or IDREF attribute to an element type *is* "using it on elements". (Personally, I would have made "IDness" and "IDREFness" properties that are orthogonal to type. I can't see any good reason forIf we accept IDs must be unique within the document, I have encountered many reasons, such as "integers" that aren't (ie leading zeroes), and dates that turn out later to need multiple occurrences. But the SGML and DTD legacy weighed strongly on the XSD designers.) I am very glad they did. Peter On 1 Mar 2022, at 23:32, Roger L Costello <costello@mitre.org> wrote: Hi Folks, DTD only allows attributes to be of type ID and IDREF. XML Schema allows both attributes and elements to be of type ID and IDREF. Why? Is there a compelling use case for declaring an element to be of type ID? Is there a compelling use case for declaring an element to be of type IDREF? /Roger _______________________________________________________________________ XML-DEV is a publicly archived, unmoderated list hosted by OASIS to support XML implementation and development. To minimize spam in the archives, you must subscribe before posting. [Un]Subscribe/change address: http://www.oasis-open.org/mlmanage/ Or unsubscribe: xml-dev-unsubscribe@lists.xml.org subscribe: xml-dev-subscribe@lists.xml.org List archive: http://lists.xml.org/archives/xml-dev/ List Guidelines: http://www.oasis-open.org/maillists/guidelines.php_______________________________________________________________________ XML-DEV is a publicly archived, unmoderated list hosted by OASIS to support XML implementation and development. To minimize spam in the archives, you must subscribe before posting. [Un]Subscribe/change address: http://www.oasis-open.org/mlmanage/ Or unsubscribe: xml-dev-unsubscribe@lists.xml.org subscribe: xml-dev-subscribe@lists.xml.org List archive: http://lists.xml.org/archives/xml-dev/ List Guidelines: http://www.oasis-open.org/maillists/guidelines.php -- Peter Flynn Cork 🇮🇪 Ireland 🇪🇺
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