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E Catalog

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In E-Commerce systems, like online shops, there is a need to present a variety of products to online customers. These products can be unrelated like food and books, or related in a hierarchical classification structure. The product information needs to be organized in a way that enables the customer to do searches, matches, and comparisons between different products based on some common product attributes. The common solution for this is to represent all products in a store in a catalog, either in a print format, or in case of online store, an electronic catalog.
To simplify the catalog building process and customer browsing of a catalog, products are often classified into categories where similar products that share common attributes are in one broad category. An example would be footwear, where each product in this category shares some common attributes like size, material, color, gender (male, female, or children), and then can have more specialized sub-categories like sports footwear.
Another example would be an appliances category where all have more specialized sub-categories like sports footwear. Products share common attributes as an operating voltage, color, energy consumption, dimensions (height, width and length), and further have some special sub-categories like refrigerators.
An online store would be interested with categorizing its products to be able to add new products efficiently, as it would only need to add the new product to its sub-category and specify values for its attributes that were defined in the product subcategory and all the parent categories. Therefore, re-using previously defined attributes for a product category.
A typical customer would be interested with selecting a product based on certain attributes, like selecting a stainless steel refrigerator, and then to compare on other attributes like getting

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