OpenCart: XML Generator

A customized XML file generator is developed to download product data to websites:
by rosetka.ua
The prom.ua
by nadavi.net
The price.ua
by hotline.ua
Vcene.ua
The pay.ua
by hotprice.ua
The Google Merchant Center

Opportunities :
- the selection of parameters (atributes of goods), which are derived into the file,
- selecting the fields from the product card, the values from which are derived as parameters,
- adding to the file parameters that must be in the XML file but are not on the site (e.g. delivery information),
Select the products about which the information is drawn into the XML file,
- the extraction to the file of goods that have no options and goods with the same option,
- extraction to the file of products with Related Options (the Module Related Options is supposed to be available),
- manually forming a list of categories of Roosets, to which the goods of the site will be drawn,
Choosing categories for each product,
- the establishment of the individual price and the old price for each product,
- manual and/or automatic setting of the value of the attribut id for goods,
XML file is very large.