Add tables to query build datasource ,addlink,relation    static void QBDSExample(Args _args)    {      Query          query;      QueryBuildDatasource  datasource;      ;      query = new Query();      // Add purchtable main datasource      datasource = query.addDataSource(tableNum(purchtable));      // Add child datasource "purchline"      datasource = datasource.addDataSource(tableNum(purchline));      // Set the join mode      datasource.joinMode(JoinMode::InnerJoin);       datasource.relations(false);      datasource.addLink(fieldNum(purchtable, purchid),        fieldNum(purchline, purchid));      info(query.xml());    }     
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