35 lines
996 B
Plaintext
35 lines
996 B
Plaintext
``++ID++`` and ``++IDREF++`` are constructs inherited from DTDs, and they suffer from painful drawbacks, mainly:
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* ``++ID++``s are too widely scoped: an ``++ID++`` must be unique in the XML document. This means that if an XML document contains ``++<Person>++`` elements and ``++<Dog>++`` elements, both with a "name" attribute of ``++type="xs:ID"++``, then two people can't have the same name. Neither can two dogs, or a person and a dog.
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* IDs must comply with tight naming scheme. For example, "123" is not a valid value for an ID.
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Instead, ``++KEY++`` and ``++KEYREF++`` should be used. And if you really need to insure uniqueness, use ``++xs:unique++`` to add a uniqueness constraint.
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== Noncompliant Code Example
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[source,xml]
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----
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ToDo
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----
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== Compliant Solution
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[source,xml]
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----
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ToDo
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----
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ifdef::env-github,rspecator-view[]
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'''
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== Implementation Specification
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(visible only on this page)
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include::message.adoc[]
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include::highlighting.adoc[]
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endif::env-github,rspecator-view[]
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