> For the complete documentation index, see [llms.txt](https://altme-documentation.gitbook.io/altmes-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://altme-documentation.gitbook.io/altmes-documentation/alme-wallet/wallet-rendering/input-descriptors.md).

# Input descriptors

Input descriptors are used to specify the data or credentials needed to issue a credential. It is a main feature of DIF Presentation Exchange. See <https://identity.foundation/presentation-exchange/#presentation-definition> for more information.

An example here with only input descriptors (EmailPass required to issue a credential) :

```
{
"credential_manifest": {
  "presentation_definition": {
    "id": "32f54163-7166-48f1-93d8-ff217bdb0653",
    "input_descriptors": [
      {
        "id": "emailPass_input_1",
        "constraints": {
          "fields": [
            {
              "path": [
                "$.type"
              ],
              "filter": {
                "type": "string",
                "pattern": "EmailPass"
              }
            }
          ]
        }
      }
    ]
  }
  }
}
```

Example to request any credentials with the attribute birthDate

```
{
"credential_manifest": {
  "presentation_definition": {
    "id": "32f54163-7166-48f1-93d8-ff217bdb0653",
    "input_descriptors": [
      {
        "id": "#765765",
        "constraints":
          "fields": [
            {
              "path": [
                "$.credentiaSubject.birthDate"
              ]
            }
          ]
        }
      }
    ]
  }
  }
}
```