KExCel: Generate spreadsheets in Microsoft Excel format

This class can be used to generate spreadsheet files in Microsoft Excel XML format.

The class can build an Excel sheet document by first defining the column titles and then the data of each of the sheet rows.

The class can return the generated document as a string value or serve for download from the current script.

The code and the comments are in Spanish.

In Spanish:
Clase básica para exportación a excel, fácil de manejar.