Report in HTML web service... unnecessarity tags added

My requirement is to generate a report in html format in sap and get it through a web service.
I need to invoke a sap web service which executes a report function and returns the report in HTML format.
I am using an RFC BAPI which uses WWW_HTML_FROM_LISTOBJECT function to convert report to html.
The problem is when the RFC is returning xml data with the html extra data is also being sent which are not of UTF8 charset format but windows-1252 charset.
So I am unable to parse that xml.
The extra tags added are <LIST_PAGES>...</LIST_PAGES>, <HYPER_TAGS>...</HYPER_TAGS>, <XFORMAT_DESCRIPTION>...</XFORMAT_DESCRIPTION>. I think these are being added by WWW_HTML_FROM_LISTOBJECT function.
I don't want these tags to be sent... how can I solve it.
I hope the question is clear... Please try to help me.
Thank you.

I managed to test the web service working from another APEX environment.
Then I created Form and Report on Web Service page but when I tried to Submit the page to get the report filled with web service, it gave me this error:
ORA-19025: EXTRACTVALUE returns value of only one node

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