Query Service in SAP WEB AS 6.20

Hello everybody,
I want to use Object Services at a SAP WEB AS 6.20 system. In the SAP help documents I have read that a Query Service is part of that Object Service. Generating a Persistence Class and the Class Actor (CA-Class) at a WEB AS 6.20 System I cannot find this Query Service. There is no method called IF_OS_CA_PERSISTENCY~GET_PERSISTENT_BY_QUERY in the Class Actor (CA-Class).
Is there a possibility to add this service to version 6.20?
At SAP WEB AS 7.0 the Query Service is available.
Can anybody help me?
Thanks and Regards,
Georg

Hi Reiner! Thanks for your reply!
- I want to create a secure connection between the .NET client and the SAP Web AS 6.20 Web Service, and HTTPS would be great. Is there any documentation regarding this issue?
- No, I don't want to provide the result of a Web Service as a Web Service. Maybe I was quite unclear... :/ What I meant was:
I want my Web Service to return a table (the result comes in the structure of a table). How do I define the Out-parameter in transaction se37 to accomplish this? Right now the best solution I got was to construct an array of strings (like the ZZVALUES int array in the example) where each position of the array, is a string that has the various fields of the table i want to return concatenated.
I'm able to retrieve the array in Visual Studio .NET 2003 client, and separate the fields (to fill a table again with them). If I could just return the table from SAP and receive it in .NET would be much more simpler.
Thanks again.

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