# Creating a schema

## Create a Schema

Go to the aCheck Home page

Click the **Add Schema** button. The Add Schema for is shown

Enter a name for your new schema. 'Covid-19 test report' for example

Enter an Original Data Supplier for your new Schema. This is a label for identify where the Schema data will originate. 'SuperMed Pharmaceutical Ltd.' for example.

Click the **Add** button.

Congratulations! You've created a Schema.

{% hint style="info" %}
Schemata cannot be used until an expiry policy has been defined.

Any Schema that does not have an expiry policy has an ℹ️ symbol
{% endhint %}

## Define an expiry policy

Go to the aCheck Home page

Click a Schema to display the Schema configuration page.

Click the **Change** button next to the Expiry policy label. The Set expiry policy form is displayed

Choose either a Date-based policy or a Duration-based policy.   

#### Date-based policy

A date-based policy means all QR codes will expire on a certain date.

Pick any time in the future using the date picker

#### Duration-based policy

A Duration-based policy means QR codes will expire a certain amount of time after they are created.

Pick a duration from the dropdown. Durations are: 1 week, 2 weeks, 4 weeks, 12 weeks, 24 weeks and 52 weeks.