This work is devoted to the problem of neural model interchange between different simulation systems. We propose to use XML notation for full description of neural models, including the types of data input to and output from the models and its preprocessing, the detailed forms of the models, and how to interpret their results. The first version of DTD for neural model description language is developed. A model description structure and contents of main issues in XML document and example of software structure for handling files with neural model description are presented.