| http://www.w3.org/ns/prov#value | - See this article: Templates and Duck Typing (http://devnet.developerpipeline.com/documents/s=9843/q=1/cuj0506koenig/)The problem with duck typing is that you can not specify any constraints in the interface; it matches everything, and only potentially crashes in the implementation, not at the call-site, where the error arguably are (incompatible types used for the arguments).
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