7.10. The notation Element
A notation provides a mechanism for an XML validator to locate external programs or processing instructions. An XML validator does not intrinsically validate notations. However, during validation of a corresponding XML instance, a notation must exist for each reference from an element or attribute whose corresponding structure type specifies an enumeration of the built-in notation datatype. While there are no specific requirements, the intention of a notation is that the value for a notation in an XML instance is somehow relevant to URIs specified by the notation.
Each notation must specify a system attribute, a public attribute, or both. The value of a system attribute frequently identifies a file, which might be ...
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