Let's go straight forward, the subject is NOT using 's or of, but why sometime we should show possession/ownership using 's or of, why sometime not ?
- The family name = the name of the family = the family's name
- The dog's leg = the leg of the dog
- The object property = the property of the object = the object's property
- A recipe example = an example of recipe = a recipe's example
Which are right or wrong ? Could we omit 's in informal language ? When ?
What would be acceptable in a more complex sentence like:
The object property's value must be defined
The value of the object's property must be defined
The object's property's value must be defined
The object property value must be defined
To be honest I feel that these apostrophes are very useless most of the time. So how to be as clear, concise and valid as possible ?