@dishasharma , Primary key is mandatory in a schema. If you don't have any dedicated attribute for primary key, then you can define autopk="true" which will create an attribute @id with datatype as long and whenever a new data get inserted into this schema, @id will keeps on incrementing.
If you have a dedicated primary key in your schema, then you don't have to add autopk="true", instead you can create primary key using your attribute with below syntax
<key name="PrimaryKey" internal="true">
<keyfield xpath="@name"/>
</key>
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