XML Schema Confusion ... ?

Ok, I am new to this so sorry if the error is something obvious, but I can't seem to get the bit of code below to work properly:

<xs:element name="doctext">
<xs:complexType>
<xs:sequence>
<xs:element name="primary" type="xs:string"/>
<xs:element name="secondary" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:element>

Upon validation, I get a message telling me that the primary and secondary elements were not declared. Yet the code below (from the same Schema) worksd fine.

<xs:element name="administrative">
<xs:complexType>
<xs:sequence>
<xs:element name="id" minOccurs="1" maxOccurs="1">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:length value="15"/>
<xs:pattern value="\d{3}-\d{4}-\d{6}"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
<xs:element name="status-comment" type="xs:string"/>
<xs:element name="copyright" type="xs:string"/>
<xs:element name="sponsor" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:element>

Other than the simpleType restriction on the id element, I can't see anything that would cause one code snippet to work and the other not. Any leads would be appreciated.