I assume in most applications, the delimiter in the trail should be the same on all pages. If it's not '->', it has to be specified in each and every page. Instead, it would be better to have a configuration file (e.g. trails-tag.properties) that provides the default delimiter. For example, I like » so I can put that in the configuration file, and only pages that require a different delimiter (can't think of any in my application) would use the overriding attribute of the list tag.
The same is true for other attributes like showFinalDelimiter and type.
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