Data classification for data lake catalog

A computer program product for a data classifier, the computer program product comprising:

• a computer readable storage medium having computer readable program code embodied therewith, wherein the computer readable storage medium is not a transitory signal per se, the computer readable program code comprising instructions for execution by a processor that cause the processor to:
• extract from a structured text business data input, via natural language understanding processing, training set data elements that are selected from the group consisting of training keywords, training concepts, training entities, and training taxonomy classifications;
• identify associations within the structured text business data of each of a plurality of business classes with respective ones of the extracted training set data elements, wherein the business classes comprise at least one of business terms, entity names, attribute names, and column names;
• and
• build a logical relationship data classification training knowledge base ontology that connects ones of the business classes to respective associated ones of the extracted training data elements as questions, into a plurality of knowledge base ontology question-business class associations.