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Definitions of simple elements and types |
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XML schema privides a mechanism to bound the values of elements
and attributes to concrete data types, like integer and date.
This information will be used by validator-tool to check the document
for validity as well as parse value to final laguage-based types.
XML schema contsaines a huge set of predefined simple data types.
In our sample schema we'll use them to define some attributes:
<xs:element name="purchase-order">
////////////// define date attribute of type date:
<xs:attribute name="date" type="xs:date" use="required"/>
////////////// order number should be an integer:
<xs:attribute name="number" type="xs:integer" use="required"/>
////////////// both attributes are marked as 'required', thus absence of each
////////////// one of them will lead a validation error;
...
////////////// element can also have a primitive value:
<xs:element name="address" type="xs:string"/>
...
</xs:element>
</xs:schema>
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