「#5647. a friend of mine --- 2重属格」 ([2024-10-12-1]) に続き，double_genitive あるいは post-genitive と呼ばれる，この妙な表現の意味的特徴を考えてみたい．
　Quirk et al. (17.46) によれば意味的特徴は2つある．(1) of の後ろに来る名詞句が定的 (definite) であり人間 (human) であること，(2) 一方，of の前に来る主要部は不定的 (indefinite) であることだ．

. . . It will be observed that the postmodifier must be definite and human:

an opera of Verdi's	BUT NOT: *an opera of a composer's
an opera of my friend's	BUT NOT: *a funnel of the ships

There are conditions that also affect the head of the whole noun phrase. The head must be essentially indefinite: that is, the head must be seen as one of an unspecified number of items attributed to the postmodifier. Thus [1--3] but not [4]:

A friend of the doctor's has arrived.	[1]
A daughter of Mrs Brown's has arrived.	[2]
Any daughter of Mrs Brown's is welcome.	[3]
*The daughter of Mrs Brown's has arrived.	[4]

As a consequence of the condition that the head must be indefinite, the head cannot be a proper noun . . . . Thus while we have [5], we cannot have [6] and [7]:

Mrs Brown's Mary	[5]
*Mary of Mrs Brown	[6]
*Mary of Mrs Brown's	[7]

　なるほど a friend of mine のタイプの2重属格表現の各要素を主に定・不定 (definiteness) の観点から分析すると，上記の2つの特徴があることはわかった．だが，考えてみれば，これらは代替表現である one of my friends についても当てはまる意味的特徴である．この2種類の表現が意味的に異ならないとすれば，共存している意義は何なのだろうか．

　・ Quirk, Randolph, Sidney Greenbaum, Geoffrey Leech, and Jan Svartvik. A Comprehensive Grammar of the English Language. London: Longman, 1985.

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