Published at LXer:

In the two previous articles my focus was on the catching an error where it was impossible to generate any valid menu, even the many of the meta tags in the head(er) section were unknown. The next possible error of significance to be examined here is the case where the menu should exist, but the file that contains the appropriate listing and links is absent. Again it is impossible to generate the menu, but for a differing underlying reason. Moreover, the severity is no less than the first set, it is just found later in the process.

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