I am new to XSD and have spent about 3 hours trying to find out if what I want to do is possible

 

I have a stock element. This element has several child elements eg Currency, number and name. My problem is that I want (if possible to allow a choice re the type_of_stock. I want to limit it to either Equity or Bond - I have found two ways of doing this - either using enumeration or patterns. I have no preference as to which. However if they select BOND I want to force the user to input further elements eg the Interest_rate.

 

Is there any way of doing a test and if I see BOND in the type_of_stock element I ask for the extra elements - or am I trying to achieve the impossible via an automated process

 

<xs:element name="stock">
<xs:complexType>
<xs:sequence>
<xs:element name="Stock_Number"> <xs:simpleType> <xs:restriction base="xs:string"> <xs:minLength value="1"/>
<xs:maxLength value="20"/>
<xs:whiteSpace value="collapse"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
<xs:element name="Stock_Name">
.
.
</xs:element>
<xs:element ref="Currency">
</xs:element>
<xs:element name="types_of_stock" type="types_of_stock"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:complexTypename="types_of_stock">
<xs:all>
<xs:element name="Equity">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:pattern value="EQUITY|BOND"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
<xs:element name="Bond">
<xs:complexType>
<xs:sequence> <xs:element name="Interest_rate">
<xs:simpleType>
<xs:restriction base="xs:decimal">
</xs:simpleType>
</xs:element>
<xs:element name="Issue_date" type="xs:date"/>
<xs:element name="Expiry_date" type="xs:date"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:all>
</xs:complexType>

 

etc

 

Any suggestions gratefully received

 

Helen