Difference between and in schema definition?

Question

I am using xsd:all in a complex type. When I miss any mandatory elements while validating it will show all the elements. It will not display the exact missed e

Answer 1

All Indicator

The indicator specifies that the child elements can appear in any order, and that each child element must occur only once:

Sequence Indicator

The indicator specifies that the child elements must appear in a specific order:

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