XpoLog help - Multi Filter Definition 

Multi Filter
In order to help you analyze and process the logged data we also built a multi filtering mechanism that allows you to define more complex filters easily. You can get to the multi filter page from the log view by clicking on the Multi link in order to create a new multi filter or on the edit link in order to edit a multi filter. A Multi filter is a combination of regular filters and/or other Multi filter where you can define the logical relation between them. That ability gives you the power to built very complex filters definition.
Example
Lets assume you defined two filters in the system one called name1 is defined to present the last 20 records with priority Error. The other name2 is defined to present a filter on priority debug which contain a specific string in a specific columns. Now you would like to see records that correspond to the two filters. You click on the Multi filter link in the log view screen. In front of you you will see to lists on the left side you will see the list of registered filters name1,name2 on the right you will see an empty list. select name1 on the let and click add, you will see name1 on the right list as well. do the same for name2. Now you select the logical relation between them as OR so both records correspond to one of the filter will be presented. You can now creat a name3 filter that how only a specific Thread in you system and create another Multi filter that combined both the Multi filter you created and filter name3 you can define a logical OP as AND to see records that came only from this specific Thread and answer all the other filters.

Additional links

      Filter help
      Global Filter help 
      Log View help