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XML SCHEMA

XML SCHEMA. Schema. A schema is a collection of: type definitions simple type complex type (contains element or attribute) element declarations. Example xml & xsd. Complex Type Definitions. The elements must appear in the same sequence The attribute must contain “US”.

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XML SCHEMA

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  1. XML SCHEMA

  2. Schema • A schema is a collection of: • type definitions • simple type • complex type (contains element or attribute) • element declarations

  3. Example xml & xsd

  4. Complex Type Definitions • The elements must appear in the same sequence • The attribute must contain “US”

  5. Complex Type Definition • The “ref” attribute is for referencing an existing element • The value of this attribute must reference a global element (declared directly under schema)

  6. Occurrence Constraints • For elements: • minOccurs: default 1 • maxOccurs: defalut 1 • For attributes the “use” attribute has the following value: • required • optional (default) • prohibited • “default” attribute is for both attribute and element definitions • default attribute values apply when attributes are missing, default element values apply when elements are empty

  7. Global Elements • The declaration enables the element to appear at the top-level of an instance document • In the example, both purchaseOrder and comment can be the root • cardinality constraints can not be put to global declarations

  8. Simple Types • string • normalizedString • token • byte • unsignedByte • base64Binary • hexBinary • integer • positiveInteger • negativeInteger • nonNegativeInteger • nonPositiveInteger • int • unsignedInt • long • unsignedLong • decimal • float • double • boolean • time • dateTime • duration • date • anyURI • language • ..........

  9. New simple types • by deriving from existing simple types (restricting)

  10. Enumeration

  11. List Types

  12. Union Type

  13. Anonymous Type

  14. Complex Types from Simple Types

  15. Empty Content

  16. Content Structure • all • sequence • choice

  17. Choice & Group

  18. All

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