1. The XML attributes "id", "type" and "name" are saved in the root element <asset>. A column is created in the asset table of the SQL database for each of these attributes. The assignment of attributes to a column is done using mapping entered into the "attribute_mapping" field. To do that you have to select the entry "Attribute" in the "storage" field.
2. In the asset element a feature is created that is represented by the <asset_feature> element. The feature name and value are XML attributes in this element.
3. Asset XML structures are displayed in a very simplified fashion. Other attributes and XML elements were left out in order to make everything clearer.