XSD For Zoho CRM API

Hi,
We are planning to integrate ZOHO CRM with our Product using REST API.
Our requirements are below.

1) Getting all the Report and Views names, ids along with the corresponding Report Folder names
( Salesforce CRM has report Folder concept and Microsoft CRM have View concept. Zoho has both of these flavors( Report Folder and View ))

2) Getting all the records belongs to the report or view
3) Getting all the details of a record ( Contact, Lead, Cases, .... )
4) Getting all the activity history belongs to a record ( Contact or Lead )
5) Updating a record ( Contact or Lead )
6) Adding an activity and associating with a record ( Contact or Lead )

I would like to know the rest URL for all of the above requirements.

Also, it looks like you support json for response and XML for posting data.
Is there any XSD which i can refer for the complete request and response format for all kind of requests?

Thanks,
Udayabaski