Step 1
Objects: Storefront, Sign, Text 'Bookstore'

Step 2
General Objects: Storefront, Sign
Text in the Image: Text 'Bookstore'
Objects that specifically refer to the Proper Noun of the Real World: N/A

Step 3
triplets: [Storefront, General Objects, has, Sign, General Objects], [Sign, General Objects, has, Text 'Bookstore', Text in the Image], [Text 'Bookstore', Text in the Image, is on, Sign, General Objects]

Step 4
(1) Node with max degree: Storefront.
(2) Location of Storefront: [Spanning the entire background of the canvas].
(3) Location of Sign and Text 'Bookstore': Sign: [Upper part of the Storefront]; Text 'Bookstore': [Centered on the Sign].

Step 5
Bounding Boxes of the Objects:
Storefront, General Objects: [0.000, 0.000, 1.000, 1.000] - The storefront occupies the entire background.
Sign, General Objects: [0.200, 0.100, 0.800, 0.300] - The sign is placed in the upper part of the storefront.
Text 'Bookstore', Text in the Image: [0.300, 0.150, 0.700, 0.250] - The text is centered on the sign.

Step 6
{"Storefront": {"phrase": "Storefront","coordinates": [0.000, 0.000, 1.000, 1.000]},
 "Sign": {"phrase": "Sign","coordinates": [0.200, 0.100, 0.800, 0.300]},
 "Bookstore": {"phrase": "Text 'Bookstore'","coordinates": [0.300, 0.150, 0.700, 0.250]}}