The interface which should be implemented by the classes which have to analyze each
vCard entry minutely.
Here, there are several terms specific to vCard (and this library).
The term "entry" is one vCard representation in the input, which should start with "BEGIN:VCARD"
and end with "END:VCARD".
The term "property" is one line in vCard entry, which consists of "group", "property name",
"parameter(param) names and values", and "property values".
e.g. group1.propName;paramName1=paramValue1;paramName2=paramValue2;propertyValue1;propertyValue2...
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