| http://www.w3.org/ns/prov#value | - A further source of data for the system is via online link to remote sites, for example via the Internet, to which end the system is provided with a network interface 30 coupled to the bus 12. [0026] FIGS. 2 to 4 schematically illustrate the basic principles of tracing in incremental garbage collecting using a tricolour marking scheme, the terminology of which will be used in the following example
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