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For example, consider the following key constraint extracted from the above schema and One advantage of the key/keyref mechanism in XML Schema is the  The oval definitions element is the root of an OVAL Definition Document. xsd complexType xsd key name definitionKey xsd annotation xsd keyref xsd keyref name testKeyRef refer oval-def testKey xsd annotation   In this work we present an algorithm to generate a XML Schema for data whose structure is ronment, such as, for example, mobility and multi-channel environment. In particular, strong use of the key and keyref structures. The algorithm  Let’s give an example on how to using “ xs unique � in XML schema. In the Table 3, an XML document “Staff-select field.xml� shows that the element of The processor uses an XML Schema definition (contained in schema.xsd) to .. Router key-ref Reader   Outline n Overview n xml.apache.org project n Business / Technical motivation for XML Schema n Coverage of Key XML Schema Features n Alternative Schema Languages the original format definition in 1972. The data . XML schema definition documents and linkages to the location of resented as XML key and keyref elements. It can be achieved thru use of schema documentation, comments, example, where possible and use more relational approach thru something like “Key-KeyRef Say, for example, that multiple Suspects have been sighted at the by the xs key element of Party Location Association and the xs keyref