Some government organizations and industry-wide standardization committees have produced standard DTDs and XML Schemas. The case for adopting a standard for exchange of information with other organizations is incontrovertible.
But when exchange is not a core issue, or when data could be stored locally in a more appropriate format, the picture then becomes more complex.
There are powerful reasons for considering the adoption of a standard model:
The costly and time-consuming task of developing a custom model is avoided.
The model usually benefits from the wisdom of many expert contributors.
The model usually benefits from the contribution of at least one XML expert.
In addition, consider the case of two organizations ...