If you are defining a schema that has elements or attribute of numeric types and require more restrictions on their value, try to avoid using pattern facets. If you do, you will get the warning: Warning: Type (name of your type) is restricted by a facet
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One interesting simple type that can be the cause of a number of static type issues is xs:anySimpleType. This type is the base type of all simple types. That includes list and union types. By default, attributes are typed xs:anySimpleType, so if you do
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