# Syntax & Smart Contract requirements

General syntax model: 

*  `// ACL` commented line. (top code recommended)
* `var input = {}:` Smart Contract object. Data structure where the requested metadata*(headers, path, jwt, etc.)* is stored.
* `if(ACL)=>{}`statement, deploy conditions. This is the ACL-feature execution context, indeed.
* `throw` excepted output.

This are the requirements to implement successfully the ACL feature. Let's dive a bit into them just to understand the context of their implementation.

`"// ACL"` comment: new instance of ACL execution is required.

`var intput = {};` reserve memory location for self execution inputs.

`if(ACL){`

`if (path[2] === "_storage"){`

    `res= { private:"you have no perms to            see this" };`

`sendResponse(res);`

`}else { <Smart-Contract-Logic> }`

This statement is the place to deploy every case in which the ACL should throw anything special. for example: *"this route should be private"* or *"this request should return directly data".*

*"Throw Exception"* if custom actions are required otherwise will execute a normal API request.&#x20;