| http://www.w3.org/ns/prov#value | - Similarly, any appropriate combination of hardware, databases, and/or software may be used at local servers 104 a-104N to implement local metadata engines 214 a-214N, local schema engines 216 a-216N, local hierarchy engines 218 a-218N, local messaging engines 220 a-220N, local annotation engines 222 a-222N, and local tag engines 224 a-224N. For example, a server or computer such as computer 300, d
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