XSD SchemaLesson 93Free preview

XSD Indicators

This lesson is part of XML · All levels

Summary

The indicator determines how the child element is arranged: xs:sequence sequence, xs:choice one, and xs:all free sequence. The indicator can be wrapped in xs:group or xs:attributeGroup so that the same declaration can be reused. The important rule, xs:all should only contain children with minOccurs 0 or 1 so no child can be repeated.

Key points

xs:sequence: child appears in the order of declaration
xs:choice: only one branch that appears
xs:all: free order, but each child maximum once
xs:group allows reuse of sequence, choice, or all models
xs:attributeGroup groups attributes to be referenced

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