NFD » ndn-cxx

# Validator Configuration File Format

You can set up a `Validator` via a configuration file. 

Next, we will show you how to write a configuration file.

The configuration file consists of **`rules`** that will be used in validation.

Here is an example of configuration file containing two rules.

    rule

    {

      for data

      name "Simple Rule"

      type self-defined

      definition

      {

        target

        {

          type name

          name "/localhost/example"

          condition isPrefixOf

        }

        signer

        {

          type name

          rule "/ndn/edu/ucla/KEY/yingdi/ksk-1234/ID-CERT"

          condition equal

        }

      }

    }

    rule

    {

      for data

      name "Testbed Validation Rule"

      type hierarchical

      trust-anchor

      {

        type file

        file-name "testbed-trust-anchor.cert"

      }

    }

Each rule has a unique name (which should be unique in the configuration file), e.g., "Simple Rule", "Testbed Validation Rule".

The rule name is specified in the property **`name`**. 

Each rule must be specified with a usage which is specified in the property **`for`**. 

Only two usages can be specified so far: either for data validation (i.e., **`fordata`**) or for interest validation (i.e., **`forinterest`**).

Each rule must have