Validate

The DDO validation within the DDO.js library is performed based on SHACL schemas which enforce DDO fields types and structure based on DDO version.

NOTE: For more information regarding DDO structure, please consult new DDO specification here.

DDO Validation Flow using DDO.js

The above diagram depicts the high level flow of Ocean core stack interaction for DDO validation using DDO.js, which will be called by Ocean Node whenever a new DDO is to be published.

Based on the DDO version, ddo.js will apply the corresponding SHACL schema to validate DDO fields against it.

Supported SHACL schemas can be found here.

NOTE: For DDO validation, indexedMetadata will not be taken in consideration in this process.

Usage of DDO validation from Library

Now let's use DDO V4 example, DDOExampleV4 into the following javascript code, assuming @oceanprotocol/ddo-js has been installed as dependency before:

const { DDOManager } = require ('@oceanprotocol/ddo-js');

const ddoInstance = DDOManager.getDDOClass(DDOExampleV4);
const validation = await ddoInstance.validate();
console.log('Validation true/false: ' + validation[0]);
console.log('Validation message: ' + validation[1]);

Execute script

node validate-ddo.js