Technology is described for associating semantic meaning with data elements. The system can include a messaging module configured to receive a message having data elements. A storage module can store the data elements from the message in a structured format. A message dictionary can be configured to identify a type of the message received and to lexically identify data elements of the message using the message dictionary and the type of message. In addition, a taxonomy module can be configured to provide a semantic meaning for the data elements of the lexically identified portions of the message. Further, a data definition tag repository can store data definition tags and link the message dictionary, the taxonomy, and storage location of the data elements in the storage module. The data definition tags can enable the semantic meaning of data elements to be queried.