Page 16 of this doc here describes InDesign Server WSDL https://wwwimages2.adobe.com/content/dam/acom/en/devnet/indesign/sdk/cs6/server/ids-solutions.pdf

indesign-server-wsdl.xml

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<definitions xmlns:tns="http://localhost:80/Service.wsdl" xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:IDSP="http://ns.adobe.com/InDesign/soap/" xmlns:SOAP="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:MIME="http://schemas.xmlsoap.org/wsdl/mime/" xmlns:DIME="http://schemas.xmlsoap.org/ws/2002/04/dime/wsdl/" xmlns:WSDL="http://schemas.xmlsoap.org/wsdl/" xmlns="http://schemas.xmlsoap.org/wsdl/" name="Service" targetNamespace="http://localhost:80/Service.wsdl">
<types>
<schema xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:IDSP="http://ns.adobe.com/InDesign/soap/" xmlns="http://www.w3.org/2001/XMLSchema" targetNamespace="http://ns.adobe.com/InDesign/soap/" elementFormDefault="unqualified" attributeFormDefault="unqualified">
<import namespace="http://schemas.xmlsoap.org/soap/encoding/"/>
<simpleType name="Enumeration">
<restriction base="xsd:long"> </restriction>
</simpleType>
<simpleType name="Unit">
<restriction base="xsd:double"> </restriction>
</simpleType>
<simpleType name="NullObject">
<restriction base="xsd:long"> </restriction>
</simpleType>
<simpleType name="SessionID">
<restriction base="xsd:unsignedInt"> </restriction>
</simpleType>
<complexType name="IDSP-ScriptArg">
<sequence>
<element name="name" type="xsd:string" minOccurs="1" maxOccurs="1"/>
<element name="value" type="xsd:string" minOccurs="1" maxOccurs="1"/>
</sequence>
</complexType>
<complexType name="RunScriptParameters">
<sequence>
<element name="scriptText" type="xsd:string" minOccurs="0" maxOccurs="1" nillable="true"/>
<element name="scriptLanguage" type="xsd:string" minOccurs="0" maxOccurs="1" nillable="true"/>
<element name="scriptFile" type="xsd:string" minOccurs="0" maxOccurs="1" nillable="true"/>
<element name="scriptArgs" type="IDSP:IDSP-ScriptArg" minOccurs="0" maxOccurs="unbounded"/>
</sequence>
</complexType>
<complexType name="Data">
<sequence>
<element name="data" type="xsd:anyType" minOccurs="1" maxOccurs="1" nillable="false"/>
</sequence>
</complexType>
<complexType name="List">
<sequence>
<element name="item" type="IDSP:Data" minOccurs="0" maxOccurs="unbounded" nillable="true"/>
</sequence>
</complexType>
<complexType name="Object">
<sequence>
<element name="specifierData" type="xsd:anyType" minOccurs="1" maxOccurs="1" nillable="false"/>
<element name="objectType" type="xsd:unsignedLong" minOccurs="1" maxOccurs="1"/>
<element name="specifierForm" type="xsd:unsignedLong" minOccurs="1" maxOccurs="1"/>
<element name="start" type="IDSP:Object" minOccurs="0" maxOccurs="1" nillable="true"/>
<element name="end" type="IDSP:Object" minOccurs="0" maxOccurs="1" nillable="true"/>
</sequence>
</complexType>
<complexType name="ObjectList">
<sequence>
<element name="item" type="IDSP:Object" minOccurs="0" maxOccurs="unbounded" nillable="true"/>
</sequence>
</complexType>
<complexType name="Field">
<sequence>
<element name="id" type="xsd:unsignedLong" minOccurs="1" maxOccurs="1"/>
<element name="data" type="IDSP:Data" minOccurs="0" maxOccurs="1" nillable="true"/>
</sequence>
</complexType>
<complexType name="Record">
<sequence>
<element name="item" type="IDSP:Field" minOccurs="0" maxOccurs="unbounded" nillable="true"/>
</sequence>
</complexType>
<element name="sessionID" type="IDSP:SessionID"/>
 <!--  operation request element  -->
<element name="RunScript">
<complexType>
<sequence>
<element name="runScriptParameters" type="IDSP:RunScriptParameters" minOccurs="0" maxOccurs="1" nillable="true"/>
</sequence>
</complexType>
</element>
 <!--  operation response element  -->
<element name="RunScriptResponse">
<complexType>
<sequence>
<element name="errorNumber" type="xsd:int" minOccurs="1" maxOccurs="1"/>
<element name="errorString" type="xsd:string" minOccurs="0" maxOccurs="1" nillable="true"/>
<element name="scriptResult" type="IDSP:Data" minOccurs="0" maxOccurs="1" nillable="true"/>
</sequence>
</complexType>
</element>
 <!--  operation request element  -->
<element name="BeginSession">
<complexType>
<sequence> </sequence>
</complexType>
</element>
 <!--  operation response element  -->
<element name="BeginSessionResponse">
<complexType>
<sequence>
<element name="sessionID" type="IDSP:SessionID" minOccurs="1" maxOccurs="1"/>
</sequence>
</complexType>
</element>
 <!--  operation request element  -->
<element name="EndSession">
<complexType>
<sequence>
<element name="sessionID" type="IDSP:SessionID" minOccurs="1" maxOccurs="1"/>
</sequence>
</complexType>
</element>
 <!--  operation response element  -->
<element name="Result">
<complexType>
<sequence>
<element name="errorCode" type="xsd:int" minOccurs="1" maxOccurs="1"/>
</sequence>
</complexType>
</element>
</schema>
</types>
<message name="RunScript">
<part name="parameters" element="IDSP:RunScript"/>
</message>
<message name="RunScriptResponse">
<part name="parameters" element="IDSP:RunScriptResponse"/>
</message>
<message name="BeginSessionRequest">
<part name="parameters" element="IDSP:BeginSession"/>
</message>
<message name="BeginSessionResponse">
<part name="parameters" element="IDSP:BeginSessionResponse"/>
</message>
<message name="EndSession">
<part name="parameters" element="IDSP:EndSession"/>
</message>
<message name="Result">
<part name="parameters" element="IDSP:Result"/>
</message>
<message name="ServiceHeader">
<part name="sessionID" element="IDSP:sessionID"/>
</message>
<portType name="ServicePortType">
<operation name="RunScript">
<documentation>Service definition of function IDSP__RunScript</documentation>
<input message="tns:RunScript"/>
<output message="tns:RunScriptResponse"/>
</operation>
<operation name="BeginSession">
<documentation>Service definition of function IDSP__BeginSession</documentation>
<input message="tns:BeginSessionRequest"/>
<output message="tns:BeginSessionResponse"/>
</operation>
<operation name="EndSession">
<documentation>Service definition of function IDSP__EndSession</documentation>
<input message="tns:EndSession"/>
<output message="tns:Result"/>
</operation>
</portType>
<binding name="Service" type="tns:ServicePortType">
<SOAP:binding style="document" transport="http://schemas.xmlsoap.org/soap/http"/>
<operation name="RunScript">
<SOAP:operation soapAction=""/>
<input>
<SOAP:body parts="parameters" use="literal"/>
<SOAP:header use="literal" message="tns:ServiceHeader" part="sessionID"/>
</input>
<output>
<SOAP:body parts="parameters" use="literal"/>
</output>
</operation>
<operation name="BeginSession">
<SOAP:operation soapAction=""/>
<input>
<SOAP:body parts="parameters" use="literal"/>
</input>
<output>
<SOAP:body parts="parameters" use="literal"/>
</output>
</operation>
<operation name="EndSession">
<SOAP:operation soapAction=""/>
<input>
<SOAP:body parts="parameters" use="literal"/>
<SOAP:header use="literal" message="tns:ServiceHeader" part="sessionID"/>
</input>
<output>
<SOAP:body parts="parameters" use="literal"/>
</output>
</operation>
</binding>
<service name="Service">
<documentation>gSOAP 2.7.8c generated service definition</documentation>
<port name="Service" binding="tns:Service">
<SOAP:address location="http://localhost:12345"/>
</port>
</service>
</definitions>