There are no limits or boundaries to the space. In geography, the world has so many countries and states. These hardly change. In consumer profiling, newer data points are added but the data points itself are not new, they are just now factored into the profiles. In the case of skills, there are limits or boundaries and added to this skills keep emerging with developments in different fields, technology developments and their applications and emerging of newer business models.
Unlike geographical boundaries, we cannot draw clear boundaries to skills areas. There is an interplay between different areas. Today automotive ventures into electronics, life sciences into information technology. What this means is that occupations in different areas require skills from those where these skills may be predominantly used or be applicable. However, we will have to take into consideration this interplay.