Here are the XML elements that can be included in an XML request body.

<Template>

    <!-- The source of the template - embedded or external. -->
    <!-- Embed template as a Base64-encoded string. -->
    <Data/> 
    <!-- The location of the external template. -->
    <Uri/> 

    <!-- Generate the report in the provided format. -->
    <OutputFormat>pdf|docx|xlsx|pptx|html|prn|csv|rtf|jpg|png|svg|eps|bmp|gif</OutputFormat> 

    <!-- If you are using printer output, use to specify main printer. Printer must be recognized by network -->
    <MainPrinter/>

    <!-- Set number of copies (integer) -->
    <PrintCopies/>

    <!-- Set first page printer if main printer is already set -->
    <FirstPagePrinter/>

    <!-- Assign print job name -->
    <PrinterJobName/>

    <!-- Generate the report asynchronously. The report can be queried or obtained later with additional requests. -->
    <Async>true|false</Async> 

    <!-- This is for Windward Scout installations only. Ignore if not Windward Scout. -->
    <ApiKey/> 

    <!-- Format of the template. Auto-determined if not provided. -->
    <Format>docx|xlsx|pptx</Format> 

    <!-- Data source description section. These elements will be applied in order. Note: Use SQL elements for SQL-only data sources. -->
    <Datasources>
        <Datasource>
            <!-- The nickname of the data source you specified in the Connection Editor in Report Designer. Use the value NoName if the data source name within the template is empty or absent. -->
            <Name/> 
    
            <!-- The data source type. -->
            <Type>sql|xml|xml2|json|odata|salesforce|salesforceoauth</Type> 

            <!-- For SQL data sources -->
            <ClassName>System.Data.SqlClient</ClassName>
        
            <!-- The connection string from the Connection Editor when you set up the data source in Report Designer. -->
            <ConnectionString/> 

            <!-- For XML, JSON, or OData data sources - embedded or external -->
            <Data/> <!-- Embed data source as a Base64-encoded string. -->
            <Uri/> <!-- The location of the external data source. --> 

            <!-- The user access token and soap endpoint for salesforceoauth -->
            <SalesforceAccessToken/>
            <SalesforceSoapEndpoint/>

            <!-- The user credentials for JSON and OData data sources (optional). -->            
            <Username/>
            <Password/>

            <!-- The domain name for JSON and OData data sources (optional). -->        
            <Domain/>
            <!-- The OData version. The Engine will use 1 if not provided. -->
            <ODataVersion>1|2|3|4</ODataVersion>
            <!-- The OData protocol. The Engine will use identity if not provided. -->
            <ODataProtocol>identity|basic|credentials|windowsauth</ODataProtocol>

            <!-- If an XSD file is used with your XML data source, use one of the following. -->
            <!-- Embed the XSD file as a Base64-encoded string. -->
            <SchemaData/>
            <!-- Location of external XSD file. -->             
            <SchemaUri/> 

            <!-- Variable section (must be within the <Datasources/> element). List of variables to use with the data source. -->
            <Variables>
                <Variable>
                    <!-- The name of the variable. -->
                    <Name/> 
                    <!-- The type of variable. The Engine will use text if not provided. -->
                    <Type>text|int|float|datetime</Type>
                    <!-- The variable's value. --> 
                    <Value/> 
                </Variable>
            </Variables>
        </Datasource>
    </Datasources>

    <!-- Settings section. These settings can be applied to the output being generated. Apply all that are needed. These settings correspond to members of the .NET Reporting Engine Report class. -->

    <!-- Template's version. Auto-determined if not provided. -->
    <Version/> 
    <CopyMetadata>never|nodatasource|always</CopyMetadata>
    <Description/>
    <!-- Name of the output file. -->
    <Title/> 
    <Subject/>
    <Keywords/>
    <Hyphenate>off|template|on</Hyphenate>
    <Locale/>
    <TrackImports/>
    <Timeout/>
    <RemoveUnusedFormats/>

    <!-- Inject the license key given. A license key specified in the request will be used instead of whatever license is specified in the engines config. --> 
    <License/>
</Template>