Apache Flink - Operator name and uuid best practices

[M Singh]

Hi:
I am working on a project and wanted to find out what are the best practices 
for setting name and uuid for operators:
1. Are there any restrictions on the length of the name and uuid attributes ?2. 
Are there any restrictions on the characters used for name and uuid (blank 
spaces, etc) ?3. Can the name and uuid be the same ?
Please let me know if there is any other advice.
Thanks
Mans