> ## Documentation Index
> Fetch the complete documentation index at: https://docs.abbyy.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Specifications

> Browse ABBYY FlexiCapture for Invoices specifications: supported countries, captured fields, data set columns, rules, keywords, and the glossary.

This section provides reference information for ABBYY FlexiCapture for Invoices.

<CardGroup cols={2}>
  <Card title="Supported countries and languages" icon="globe" href="/flexi-capture/invoice-reader/ir-supported-languages-and-countries" />

  <Card title="Captured fields" icon="table-list" href="/flexi-capture/invoice-reader/ir-extractable-fields" />

  <Card title="Detecting the main fields" icon="magnifying-glass" href="/flexi-capture/invoice-reader/ir-search-fields" />

  <Card title="Available rules" icon="list-check" href="/flexi-capture/invoice-reader/ir-rules" />

  <Card title="Keywords" icon="key" href="/flexi-capture/invoice-reader/ir-language-keywords" />

  <Card title="Extended regular expressions" icon="asterisk" href="/flexi-capture/invoice-reader/ir-regular-expression-ext" />

  <Card title="Glossary" icon="book" href="/flexi-capture/invoice-reader/ir-glossary" />
</CardGroup>

## Data set columns

<CardGroup cols={2}>
  <Card title="BusinessUnits data set" icon="table-columns" href="/flexi-capture/invoice-reader/ir-columns-bu" />

  <Card title="Vendors data set" icon="table-columns" href="/flexi-capture/invoice-reader/ir-columns-vendors" />

  <Card title="PurchaseOrders data set" icon="table-columns" href="/flexi-capture/invoice-reader/ir-columns-po" />

  <Card title="PurchaseOrdersItems data set" icon="table-columns" href="/flexi-capture/invoice-reader/ir-columns-po-items" />

  <Card title="GLCodes data set" icon="table-columns" href="/flexi-capture/invoice-reader/ir-columns-gl-codes" />

  <Card title="CostCenters data set" icon="table-columns" href="/flexi-capture/invoice-reader/ir-columns-cost-centers" />
</CardGroup>