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 Appendix A   "Extra fields"

"Extra fields" are fields specific to a category (whereas "regular fields" exist for every category). Up to eleven "extra fields" can be configured per category.

The purpose of "extra fields" is to be able to add more fields to a category when there are not enough "standard fields" for your use.

"Extra fields" can also be used to contain an information specific to a category. Example: an "extra field" representing "number of rooms" could be configured for advertisements in a "real estate category" and an "extra field" representing "mileage" could be configured be for advertisements in a "car category".

In addition, only "extra fields" can meet specific needs related to formatting.

An "extra field" can be of one of the following types:

For each "extra field", the following settings can be configured:

Figure below shows how the fields of an advertisement in a given category, result from the category "regular fields" definition and from the category "extra fields" definition.

Advertisement fields as a result from category regular and extra fields 

Note 1:

When designing categories for your FladsClassifieds website, there is one more thing to consider: it is better to use "regular fields" than "extra fields" as far as performance is concerned. So, even if most of your categories do not need an Image "regular field" and very few need that field, prefer the following alternative:

To this one:

Note 2:

There are three kinds of image fields:

Which kind of image field should you use?
If you want the image to be shown on the page that displays the advertisement list and on the page that displays the details of an advertisement, then use the "regular image field" and, if you need more than one image field, create an "extra field" of type image.
If you want the image to be shown on the page that shows the details of an advertisement only, use the "regular image field" and, if you need more than one image field, use the "additional" image fields. "Additional" image fields are more flexible than "regular image field" and "extra field" of type image in terms of quantity (website administrator can configure, on a per category basis, the number of images that can be associated to an advertisement). But they can only be displayed on the page that shows the details of an advertisement, not in the page that lists the advertisements.