Compatibility and composability of digital product passports (DPPs)

### Problem description
Through a supply chain, products and their corresponding data may be subjected to and utilized by several different Guardian policies and instances. To reduce redundancies and support interoperability, product-related data from different policies and Guardian instances shall be composable and compatible so that that all data from a specific product may be compiled and discovered via digital product passports (DPPs) that can be utilized by several policies and instances across supply chains.

### Requirements
DPPs are able collect and compile product-level data by several policies and instances across supply chains. Data from DPPs can be utilized by several policies and instances across supply chains.

### Definition of done
DPPs have been developed that are composable and compatible with a multitude of Guardian policies and instances across supply chains.

### Acceptance criteria
DPP approaches compatible with all product use cases and accepted by GHG community members and other key stakeholders.