Toolkit for intensive work with metadata in specialized information systems

We present a concept of the information system for intensive work with metadata in heterogeneous data store to modify dynamically both the data and the metadata models by user. This concept is illustrated by example of such information system for the project where the digital registrar is developing for the culture heritage of Old Russian paintings, namely Dionisius frescoes in the Cathedral of the Nativity of the Virgin at the Ferapontov Monastery painted in 1502.