I built my own simple file format to store the information. Also, this application runs as a multiple document interface (MDI), so you can have as many databases open as you wish.
An image showing the multiple document interface (MDI). Also, you can see the "parent" nodes on the left hand side, along with the information contained within the parent nodes on the right hand side.
When opened in a plain text editor, the files saving by the program look like this.