we are using  validate built in policy to validate inputs with xsd,json schema which are in root server    , we are getting them through http call. does inbuilt policy cache the documents ? if so where can we check in datapower . i searched for entries in API DOCUMENT Cache in datapower, i could find entries in it.

Hi Santhoshkumar, 

I shared your question with our team and received the following response, I will outline it below: 

A question: 

1.  Was the documentation cache for the API gateway configured to cache files with these extensions? You'd need to define the document cache policy that DataPower will use through API Connect gateway extensions.

then the team provided some information/documentation as to what one could do in your case:

This is the command that defines what needs to be the API Connect gateway extension.
https://www.ibm.com/docs/en/datapower-gateway/10.5.x?topic=commands-policy
Step 10 on this task is the base documentation if this configuration was supported on the DataPower Gateway.
https://www.ibm.com/docs/en/datapower-gateway/10.5.x?topic=gateway-configuring-api
Then this topic explains the various parameters for the command with examples. Although it's for the cited traditional services, the same details apply.
https://www.ibm.com/docs/en/datapower-gateway/10.5.x?topic=manager-defining-document-cache-policies

let me know if this works - it would also help us if you could provide a bit more context as to your use case/scenario/product version. 

Thank you