# Invoice

Qty | Product | Description | Unit Price | TOTAL
--- | --- | --- | --- | ---
2 | xe-1u | XMLmind XML Editor - Single User License | $200.00 | $400.00
1 | xe-5u | XMLmind XML Editor - 5-user Pack License | $800.00 | $800.00
1 | fc-uu | XMLmind FO Converter - Unrestricted Use License | $3,000.00 | $3,000.00
1 | sc-cs | XMLmind Spell-Checker - Client/Server License | $100.00 | $100.00
SubTotal | $4,300.00
VAT | 19.6% | $842.80
TOTAL | $5,142.80

The VAT rate 19.6% is the VAT rate of France.

# What to do with this demo?

> Note: the integrated spreadsheet engine is a feature available only in XMLmind XML Editor Professional Edition, where it is hidden by default. You need to enable it by checking "Enable the Integrated Spreadsheet Engine" in Options|Preferences, Features section.

- Change quantity, product reference (available products are found in spreadsheet-demo/products.xhtml), unit price or VAT rate, then click in (or tab to) another cell to see how the spreadsheet is updated.
- Copy/paste a product row and modify any of the above cells in the new row.
- Delete a product row.
- Double-click on the little `f` icon to display the formula editor. (`f` icons are found before text generated by spreadsheet calculations.)
- Change the `xml:lang` attribute of the `html` root element from "`en`" to "`fr`". Then undo the spreadsheet calculation and also undo the attribute change.
- More information in XMLmind XML Editor - Using the Integrated Spreadsheet Engine.