"valuation" in linguistics -- sense not in OED?

[Joel S. Berson]

In the Wikipedia article on Hangul, one reference is
Silva, David J. (2008). Missionary contributions
toward the revaluation of Hangeul in late
nineteenth-century Korea. Int'l J. Soc. Lang. 2008, vol 192, pp57–74.

Not knowing what "(re)valuation" meant, I looked
in the OED, but I don't find a sense that
pertains to linguistics.  Is this "valuation"
different enough from the customary senses to merit one of its own?

Joel

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