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• XML Schema

• Francesco Ierna

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XML Document

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XML Schema

XML SCHEMA :

A way of describing and constraining the content of XML documents.

Three parts:

• Datatypes

4. Contranints the XML Documents

5. What schema are and how one builds a schema

Four main elements:

• Xsd:element : contains simple or complext type if no type is specified

6. Xsd:attribute( always simple type, no order req)

7. Xsd:complextType : descrive how elements that contains other elements are organized. Can extends and restrict

Sequence : optional element

8. All :any order, maxOccurs 1 and MinOccurs 0, in all group 9. Choise : one of elements contained in the choise element to be present in the containing element Xsd:simpleType( derives from existing type, restricting): cannont t contains child elements or attributes

Derives frome existing type

10. Rescrting existing type (xsd:rescriting)

• • • length ,minLength ,maxLength ,pattern ,enumeration ,whiteSpace ,maxInclusive ,maxExclusive ,minInclusive ,minExclusive ,totalDigits ,fractionDigits

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Example.XSD

---------------> < order_request > < company_name >IBA JV < product_id >C-0YST < product_price >500.00 order_request > 12.

Example XML

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Include Redefine- Import

1."include" Component- This component brings all declarations and definitions of anexternal schema document into the current schema . The external schema document must have the same target namespace as the current schema. "include" components are usually used to build a new schema by extending existing schema documents. 2."redefine" Component- This component offers the same functions as the "include" component. But a "redefine" componentalso allows you redefine some datatypes provided in the included schema document . "redefine" components are usually used to revise a schema by redefining datatype definitions of existing schema documents. 3."import" Component- This component offers the same functions as the "include" component except that theincluded schema document has a different target namespace."import" components are usually used to build a new schema by borrowing element declarations from existing schema documents from other namespaces. 14.

Import