Question about qrc and file structure

[efdiloreto]

I am trying to organize the files and I have some doubts about it.

I have the following file structure:

├── Pip-Boy.pro
├── Pip-Boy.pro.user
├── README.md
└── src
    ├── main.cpp
    ├── qml
    │   ├── main.qml
    │   └── PipMainButtonTab.qml
    └── qml.qrc

The qml.qrc file is:

<RCC>
    <qresource prefix="/">
        <file>qml/main.qml</file>
        <file>qml/PipMainButtonTab.qml</file>
    </qresource>
</RCC>

The only way to get the program works is importing the qml directory in main.qml

import "qrc:/qml"

Why I have to import the qml directory if main.qml is in this folder?