The keyedReference element cannot have "xsi:nil" as an attribute.
The keyedReference element in XML instance can be substituted with other elements.
Other element cannot use keyedReference as substitution group head if
the element's type is derived by using one of the following methods : restriction.
Use of this attribute is optional.
Its form is unqualified.
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Base type of keyName is string. There are several restrictions on the value. The schema processor collapses value's whitespace. The length of the value is less than or equals to 255.
Use of this attribute is required.
Its form is unqualified.
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Base type of keyValue is string. There are several restrictions on the value. The schema processor collapses value's whitespace. The length of the value is greater than or equals to 1. The length of the value is less than or equals to 255.
Use of this attribute is required.
Its form is unqualified.
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Base type of tModelKey is anyURI. There are several restrictions on the value. The schema processor collapses value's whitespace. The length of the value is less than or equals to 255.