In most of schema definition cases, developers will use the simple syntax to write and parse XML documents. They won't care about the complexity of set of conditional combinations. E.g. the simple use of <xsd:sequence>, <xsd:all>, <xsd:choice>.
This article introduces a case of exclusive elements combination. For example, there are three elements A, B, C. They all can optionally occur in any order, but B or C should exclusively appear at any time. As below:
<root><A/><B/></root>, <root><A/><C/></root> <!-- OK cases -->
<root><A/><B/></root>, <root><A/><B/><C/></root> <!-- NON-OK cases -->
Apparently we may use <xsd:all> for the non-ordered children, and then specify a <xsd:choice> for the alternative subordinates. However, as we know, the <xsd:all> representation does not allow any of his peer <xsd:choice>. Is it irrealizable to define such combination cases? Surely we have at least two ways to implement it.
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