The <schema> section in a WSDL file can contain any valid schema construct, including <xsd:include>.
Make sure that you encode the <xsd:include> statement properly (see the XML Schema Part 1 specification).
<include schemaLocation="url-of-the-schema" />
Included schema documents must either have (a) the same targetNamespace as the including schema document or (b) no targetNamespace at all, in which case the included schema document adopts the including schema document's targetNamespace.
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