I am looking for a way to create a custom pointer for Apache Nutch. Which configuration file should be changed and what properties should I add there?
I could not find anything useful from conf / nutch-default.xml
You will need to write your own plugin and then configure the nut to use your custom plugin.
The following link will give you a step-by-step procedure to achieve this:
http://wiki.apache.org/nutch/WritingPluginExample