Clarification on presentation_definition id:

Hi
I'm working presently working on an implemention of vc issuance data_model 2.0.

while going through the https://identity.foundation/presentation-exchange/spec/v2.0.0/ spec,

it's not abundantly clear if we could use a single presentation_definition to issue multiple vc's or do we have to generate it each time for a vc issue request.
```
"presentation_definition": {
"id": "32f54163-7166-48f1-93d8-ff217bdb0653", (it's can be globally unique as mentioned in the docs, but does it have to be generated for each request for same presentation definition?)
```