The Open Government Partnership (OGP) Global Summit in Mexico City this week brings together more than 1,500 participants, including ministers, from around the world. While OGP member governments have made notable progress toward transparency and accountability through the four-year-old partnership, there has been little attention given to making land holdings and land transactions transparent.

A call to understand a bit more about sharing data, metadata, linking things up and how it all plays together in today's Web to help answer tomorrow's challenges.

Publish data on the Web, what is Open Data, why it matter. (*) - part 1

• Why it matters
• Stop data hugging, go for Open Data !

How to make your data (re)useable by other (**, ***) - part 2

• Structure your data
• Use Open standards and formats