This is my first post, and I couldn't quite figure out under what category to place my question, so here goes nothing. Moderators, please be merciful

I have written a service, using ASp.NET & C#, that allows me to update products in the AbleCommerce webstore. But I would like to be able to update product options and variants as well - all via API calls within my service, not by using the DataPort utility. The XML that I currently submit via a POST follows the following structure:
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<?xml version="1.0" encoding="utf-8"?>
<AbleCommerceExport>
<Store>
<Products>
<Product>
<ProductId>0</ProductId>
<StoreId>1</StoreId>
<Name>10' PS/2 Extension Cable</Name>
<Price>11.99</Price>
<CostOfGoods>0</CostOfGoods>
<MSRP>15.95</MSRP>
<Weight>0.10</Weight>
<Length>2.00</Length>
<Width>2.00</Width>
<Height>4.00</Height>
<ManufacturerId>6</ManufacturerId>
<Manufacturer>Belkin</Manufacturer>
<Sku>F2N035-10</Sku>
<ModelNumber />
<DisplayPage />
<TaxCodeId>1</TaxCodeId>
<TaxCode>Taxable</TaxCode>
<ShippableId>1</ShippableId>
<Shippable>Yes</Shippable>
<WarehouseId>2</WarehouseId>
<Warehouse>Default Warehouse</Warehouse>
<InventoryModeId>0</InventoryModeId>
<InStock>0</InStock>
<InStockWarningLevel>0</InStockWarningLevel>
<ThumbnailUrl>~/Assets/images/icon_box_closed.gif</ThumbnailUrl>
<ThumbnailAltText>10' PS/2 Extension Cable</ThumbnailAltText>
<ImageUrl>~/Assets/images/icon_box_closed.gif</ImageUrl>
<ImageAltText>10' PS/2 Extension Cable</ImageAltText>
<Summary />
<Description></Description>
<VendorId>0</VendorId>
<CreatedDate>2009-07-28T17:29:34</CreatedDate>
<LastModifiedDate>2009-09-18T04:23:02</LastModifiedDate>
<ProductTemplateId>0</ProductTemplateId>
<IsFeatured>false</IsFeatured>
<IsProhibited>false</IsProhibited>
<AllowReviews>false</AllowReviews>
<AllowBackorder>false</AllowBackorder>
<WrapGroupId>2</WrapGroupId>
<WrapGroup>Small Packages</WrapGroup>
<ExcludeFromFeed>false</ExcludeFromFeed>
<DisablePurchase>false</DisablePurchase>
<MinQuantity>0</MinQuantity>
<MaxQuantity>0</MaxQuantity>
<VisibilityId>0</VisibilityId>
<Theme />
<IconUrl />
<IconAltText>10' PS/2 Extension Cable</IconAltText>
<IsGiftCertificate>false</IsGiftCertificate>
<CouponProduct />
<ExtendedDescription />
<HtmlHead />
<UseVariablePrice>false</UseVariablePrice>
<MinimumPrice>0</MinimumPrice>
<MaximumPrice>0</MaximumPrice>
<SearchKeywords />
<HidePrice>false</HidePrice>
<Categories>
<Category>
<CategoryId>40</CategoryId>
<Path>Accessories:Cables</Path>
<OrderBy>-1</OrderBy>
</Category>
</Categories>
</Product>
</Products>
</Store>
</AbleCommerceExport>
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Unfortunately however, I am having a very hard time finding information on what the XML structure of any other kind of updates might be.
Is there any way to specify a product's options within this XML structure? Such as for example "Products/Product/ProductOptions/ProductOption/..." ? Is there some other call that can be made that will create/update options and variants for a particular product?
Any help would be appreciated. Please let me know if any more details are required in order to answer my question.
Thank you!