Structure
=========
 - Network structure is monitored with "host" objects connected using "parent" 
 properties.
 - Service structure is monitored with "service" objects. There is two types
 of services: standard and host-specific. For standard services, "hostgroup"
 objects defined and services list for this hostgroup. Later hosts just tell
 that they belong to this group. The custom services are listed after the
 host description and refer this exact node only.
 - There is some standard nodes: "adei", "zeus". Several such nodes are
 defined with abstract "host" descriptions. Abstract definitions are 
 listing  the mandatory "hostgroup". So, in the actual host description
 only an extra groups should be listed.
 - As well, "hostgroup" speicifcation is used to group nodes belonging
 to certain experiment (katrin-servers).
 - Services are inheriting the abstract "service" as well. The main goal 
 to configure rate of execution for multiple services at once.
 - Finally "servicegroup" is used to group certain type of services. For
 example, ADEI services.

Experiments
===========