[itsm] Configitem Definition

Hi, I've got a simple question: Is there any documentation about the format of configitem definitions? I wonder exactly: * Are there more datatypes than: date, customer, generalcatalog, text and textarea? * What kind of syntax and expressions can be used (like: countmin, countmax, searchable, maxlength...)? * Is it posible to use some kind of logic or conditions? E.g. I need to use different Sub-blocks, depending on a selected value. Some kind of reference or manual, which can answer my questions would be wonderul. Any help appreciated! thank you in advance best regards Raphael