Extension types defined as pointers

[colinbowern]

If the app encounters an extension type such as the following from the NetSuite SuiteTalk WSDL:

<complexType name="BaseRef" abstract="true">
	<sequence>
		<element name="name" type="xsd:string" minOccurs="0"/>
	</sequence>
</complexType>
<complexType name="RecordRef">
	<complexContent>
		<extension base="platformCore:BaseRef">
			<attribute name="internalId" type="xsd:string"/>
			<attribute name="externalId" type="xsd:string"/>
			<attribute name="type" type="platformCoreTyp:RecordType"/>
		</extension>
	</complexContent>
</complexType>
<complexType name="GetRequest">
	<sequence>
		<element name="baseRef" type="platformCore:BaseRef"/>
	</sequence>
</complexType>

It defines it as:

type BaseRef struct {
    XMLName xml.Name `xml:"urn:core_2018_2.platform.webservices.netsuite.com BaseRef"`
    Name string `xml:"name,omitempty"`
}

type RecordRef struct {
    XMLName xml.Name `xml:"urn:core_2018_2.platform.webservices.netsuite.com   RecordRef"`
    *BaseRef
    InternalId string `xml:"internalId,attr,omitempty"`
    ExternalId string `xml:"externalId,attr,omitempty"`
    Type *RecordType `xml:"type,attr,omitempty"`
}

type GetRequest struct {
    XMLName xml.Name `xml:"urn:messages_2018_2.platform.webservices.netsuite.com GetRequest"`
    BaseRef *BaseRef `xml:"baseRef,omitempty"`
}

In my code I can't seem to pass RecordRef which is the correct structure that the web service is expecting. At best I can pass a pointer to BaseRef which seems to result in the encoder ignoring RecordRef's contents:

var recordTypePartner RecordType
recordTypePartner = RecordTypePartner
var recordRef RecordRef
recordRef = RecordRef{Type:&recordTypePartner,InternalId:internalIdString}

var getRequest GetRequest
getRequest.BaseRef = recordRef.BaseRef

Given Go doesn't have a concept of inheritance in the same way languages like C# and Java do, how do we handle these sorts of override / extension scenarios?