I am a beginner in German and this is my first post. I encounter the following sentence in a German article: > In vielen Fällen ... diese Eigenschaft ... , die Gegenstand dieses Kapitels ist. I can not understand the use of "**die**" in front of "**Gegenstand**"(subject, topic, theme, etc.). According to the [online dictionary](https://en.wiktionary.org/wiki/Gegenstand), "Gegenstand" is masculine, and the only two cases of a leading "die" are: nominative plural and accusative plural, where the word should be "**Gegenstände**". Is "die Gegenstand" grammatically correct ?