724 ITU‐T's Technical Reports and Specifications Figure 7 – The color‐coded to show open data's availability in China Before you can begin to use data, you have to know what's available. So another ongoing project of the open data community is a graded survey of all available data in major Chinese citiesbased on a number of categories such as urban public transportation, air quality, census, health, and economic indicators, among others. As of now, of the two cities that have been graded, about 50 percent of their datasets are open (see Figure 7), meaning they are machine‐readable. Still, the open data community hopes that after making a coordinated effort to clean up the data, it will encourage civil society to use it and that the open data community can serve as an incubator for data apps and projects63. In the last decade, a few pioneers in library and information institution have introduced the idea and principles of semantic web and linked data technology into practice. Some researchers in National Library of China, Institute of Scientific and Technological Information of China and Shanghai Library have done several experimental projects to implement linked data. However, there is no practical system that can provide online services by the end of 2014. Shanghai Library has initiated a project that aimed to establish a genealogy system based on Linked data architecture and the related semantic technologies. There are substantial genealogy materials collected by Shanghai Library. Genealogy contains rich information about families and local history, such as the ancestors, notable people, events, family members migration information,etc. Shanghai Library has the biggest Genealogy collection in China. However, the database is based on MARC format, which is the standard bibliography format for Library resources in the last six decades. It should be transformed into a RDF‐enabled format so as to be applied to the up‐to‐date semantic technology. With the development of digital humanity and semantic web, the old database based on MARC related technologies are outdated for its obsolete data model. It cannot deeply reveal the properties of the content of genealogy resources, and also cannot encode the relationship among the entities (people, places, temporal, and events etc.). The linked data technology is the feasible solution to resolve the problems. As the lightweight solution of semantic web, linked data64 is rooted in the ____________________ 63 Please see: http://techpresident.com/news/wegov/24940/China‐Open‐Data‐Movement‐Starting‐Take‐Off. 64 Tim Berners‐Lee. Linked Data [EB/OL]. 2011‐05‐15. http://www.w3.org/DesignIssues/LinkedData.html.