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What is a schema?

A schema in Documind defines the structure of data to be extracted from a document. Think of it as a blueprint or template that guides the extraction process to retrieve the correct information in the desired format.

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What can a schema do?

Schemas are used to:

  • Define the fields to extract.
  • Specify the type of data for each field (e.g., string, number, array, enum, boolean).
  • Set the relationships between fields (e.g., nested arrays or objects).

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Defining a Schema

In Documind, a schema is defined as an array of objects, each representing a field to be extracted. Each field object includes the following properties:

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name
string
required

A unique identifier for the field.

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description
string
required

A brief explanation of what the field represents.

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type
enum
required

The type of data. Options are: string, number, array, object, enum, boolean.

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values
string[]

Used when the field type is enum, to specify available options.

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children
object[]

Nested fields for array or object types.

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Example Schema

Here’s an example schema for a bank statement:

Bank statement schema
const schema = [
  {
    name: "accountNumber",
    type: "string",
    description: "The account number of the bank statement."
  },
  {
    name: "openingBalance",
    type: "number",
    description: "The opening balance of the account."
  },
  {
    name: "transactions",
    type: "array",
    description: "List of transactions in the account.",
    children: [
      {
        name: "date",
        type: "string",
        description: "Transaction date."
      },
      {
        name: "creditAmount",
        type: "number",
        description: "Credit Amount of the transaction."
      },
      {
        name: "debitAmount",
        type: "number",
        description: "Debit Amount of the transaction."
      },
      {
        name: "description",
        type: "string",
        description: "Transaction description."
      }
    ]
  },
  {
    name: "closingBalance",
    type: "number",
    description: "The closing balance of the account."
  },
  {
    name: "highValueAccount",
    type: "boolean",
    description: "Closing balance is more than 50000 ."
  },
  {
    name: "statementType",
    type: "enum",
    description: "The type of document",
    values: ["Current Account", "Savings Account"]
  }
]
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