The nursing profession generates a large number of documents, and despite a number of terminology standards in existence, lack of interoperability in process and data structure still persists. The purpose of carrying out this study was to develop an integrated, comprehensive structure of nursing process as a domain information model which could be suitable for message development which potentially can be used when implementing clinical information software. We present phases of nursing process modeling, followed by mapping the resultant model to the HL7 Reference Information Model, generating a nursing domain message information model. Also, reviewing the Clinical Document Architecture in relation to the nursing process, we present our proposal for changes required to its object model for better support of nursing documents.