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Michael Kay wrote > There are also applications of mixed content that don't fall into the > classic "marked-up text" model. For example, it can be used to record > "properties of properties", as in > <email>fred@s...<last-modified>2005-02-02</last-modified></emai l> To make this fully supported by schemas, one would need a way to indicate in schema rules for the cardinality, etc., of the "properties of properties." But there is also a versioning issue. Since adding such meta-data as the last-modified date after the fact is a typical usage, attributes today allow such annotation with less disruption to existing readers. E.g. <email last-modified='2005-02-02'>fred@s...</email> But this only works to one level. One cannot add an attribute to that attribute. One could imagine a future version of XML that treated elements and attributes with more parallelism, and allowed attributes to have structure, perhaps with an element-like syntax, as in: <email>fred@s...<@last-modified>2005-02-02</@last-modified></em ail> And <email>fred@s...<@last-modified>2005-02-02<@says-who>Joe</@says -who></@last-modified></email>
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