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in the molecule schema to

<attribute name=’elementType’

type=’elementTypeType’ use=’optional’/>

whereelementTypeTypeis defined by

...




ANSWER TO
EXERCISE2.3
One possible answer uses an enumeration of cases:

<xsd:simpleType name="DNABase">

<xsd:restriction base="xsd:string">

<xsd:enumeration value="A"/>

<xsd:enumeration value="C"/>

<xsd:enumeration value="G"/>

<xsd:enumeration value="T"/>

</xsd:restriction>

</xsd:simpleType>

Another answer uses a pattern restriction:

ANSWER TO
EXERCISE2.4
A DNA sequence could be defined using a list of bases as in