# Using a content source

Calling the **cmsinterface** servlet will provide you with an overview on how to use it.

Example:

```
  https://www.acme.com/TempusServa/cmsinterface
```

The interface requires just the name of the source, but additional parameters can be provided.

Parameters

- **q**: Name of the interface (required) 
    - This name must match "Unique NAME"
- **f**: Format of the result (optional) 
    - Valid values: html json xml
- **v**: Parameter for dynamic values (optional) 
    - The value will be substituted to the parameter in "Dynamic parameter"

Example:

```
  <a class="external free" href="https://www.acme.com/TempusServa/cmsinterface?q=mysource&f=json" rel="nofollow">https://www.acme.com/TempusServa/cmsinterface?q=mysource&f=json</a>
```