% 
\begin{figure*}
  \begin{center}
    \small
    \begin{tabular}{|p{5cm}p{5cm}p{5cm}|}
      \hhline{|---|}
      \dirtree{%
        .1 Category.
        .2 Business.
        .3 Accounting.
        .3 Communications.
        .4 Email.
        .4 Fax.
        .4 Instant Messaging.
        .4 SMS.
        .3 eCommerce.
        .4 Payment.
        .3 Finance.
        .4 Currency.
        .4 Securities.
        .4 Stock.
        .3 Logistics.
        .4 Shipping.
        .3 Marketing.
        .4 Customer Relationship Management.
        .2 Misc.
        .3 Government.
        .3 Identity Verification.
        .3 Jobs.
        .3 Real Estate.
      }
      &
      \dirtree{%
        .1 Category.
        .2 Content.
        .3 Address Information.
        .3 Demographic.
        .3 Finance.
        .4 Currency.
        .4 Securities.
        .4 Stock.
        .3 Internet Search.
        .3 Maps and Geography.
        .3 Multimedia.
        .4 Image.
        .4 Media Management.
        .4 Music.
        .4 Video.
        .3 News.
        .3 Product Information.
        .3 Regional Information.
        .3 Weather.
        .2 Value Manipulation.
        .3 Converters.
        .3 Date and Time.
        .3 Spelling and Grammar.
        .4 Translation.
        .3 Validation.
        .3 Value Generators.
      }
      &
      \dirtree{%
        .1 Category.
        .2 Consumer.
        .3 Auction.
        .3 Bookmarking.
        .3 Communications.
        .4 Email.
        .4 Fax.
        .4 Instant Messaging.
        .4 SMS.
        .3 Lending.
        .3 Shopping.
        .3 Travel.
        .2 Science.
        .3 Genetics.
        .3 Mathematics.
        .2 Utilities.
        .3 Analysis.
        .3 File and Storage.
        .3 Interoperability Tests.
        .3 Measurements.
        .3 Monitoring.
        .3 Survey.
      }
      \\
      \hhline{|---|}
    \end{tabular}
  \end{center}
  \caption{Service categories ontology}
  \label{fig:categories}
\end{figure*}
