Load the prerequisites like classifications XML files using the Loader in the Desktop Client. For more information, see Loader.
Ensure the classifications are created under the Web API Reader classification in the Loader Types classification tree.
The following is a sample XML load file used to create a sub-classification, "Instruments":
<Container>
<SDALoaderClassification>
<IObject UID="LDRC_InstrumentVariables" Name="InstrumentVariables" />
<ISDALoaderClass />
<ISPFObjClass />
<ISDALoaderClassification />
</SDALoaderClassification>
<Rel>
<IObject UID="LDRC_Web_API_Reader.SPFClassMember.LDRC_InstrumentVariables" />
<ISchemaObj />
<IRel UID1="LDRC_Web_API_Reader" DefUID="SPFClassMember" UID2="LDRC_InstrumentVariables" />
</Rel>
</Container>