XML Schema Definitions or DTD

XML Schema Definitions or DTD

Hi All,
Does anyone have the XML Schema Definitions or DTDs for all the CRM Entities? (Accounts, Invoices, Quotes, etc).

The reason I ask is because I need to check whether the XML formats that the Zoho CRM API produce change or not (in order to adapt an ETL process that extracts that information).

Several times I've had to make changes because the formats keep changing (sometimes with advance notice and sometimes not). But usually I find out after several days or weeks after the fact and I have to re-extract the information.

Thanks in Advance!!

Mateo F.