Possessive の not indicating what is possessed


Over a year ago, I wrote a text on Lang-8. I'm analyzing my texts. I wrote,
very badly, this sentence:

> この本書は、Ｌａｎｇ－８で一番日本語の本書を書きます。

I tried to say "this is my first text on Lang-8"

Yeah, looking at it now, I don't even now what I was thinking. Anyway, I
received the following correction:

> これは私の、Ｌａｎｇ－８では初めての日本語の作文です。

I need help to understand the の particle after the 私. Is it that rule where
the noun is implicit by the context, in this case, my text (作文), or the の
particle is just being connected normally with the entire sentence, but
separate with a comma, creating a different style (私のＬａｎｇ−８では…), in this case
creating a relationship between 私 and 作文? I don't think it's the former,
because Ｌａｎｇ−８では "disconnect" 私の with what comes after. If so, I never saw it
so far... Is there something with that comma?




> 「これは私{わたし}の、Ｌａｎｇ－８では初{はじ}めての日本語{にほんご}の作文{さくぶん}です。」

In this sentence, both 「私 **の** 」 and 「Lang-8では初めて **の** 」 modify the
「日本語の作文」.

Strictly speaking, the comma is optional, but that is a good place to use one
because it helps **_visually_** notify the reader right away that another
phrase would follow 「私の」 that will also modify the noun near the end of the
sentence.

In other words, a comma is often used after a phrase when the word it modifies
does not appear right after that phrase.




> 「これは私{わたし}の、Ｌａｎｇ－８では初{はじ}めての日本語{にほんご}の作文{さくぶん}です。」

In this sentence, both 「私 **の** 」 and 「Lang-8では初めて **の** 」 modify the
「日本語の作文」.

Strictly speaking, the comma is optional, but that is a good place to use one
because it helps **_visually_** notify the reader right away that another
phrase would follow 「私の」 that will also modify the noun near the end of the
sentence.

In other words, a comma is often used after a phrase when the word it modifies
does not appear right after that phrase.

