Support valueConstraint for UriTemplate and UUID

[nickevansuk]

See documentation here, rules as follows (though perhaps could be achieved within one rule “value-constraint” rule file.

Note the reason these specific valueConstraints and are not just standalone targeted rules is that they also allow the language-specific SDKs to make use of them for strong typing and data validation.

Note valueConstraint will need to be added as a property to the Field class so that it is accessible:

data-model-validator/src/classes/field.js

Line 4 in 652c8d9

const Field = class {

"valueConstraint": "UriTemplate"

• Checks that the value is a valid Uri Template, and outputs a FAILURE if not

An aside:

valueConstraint could also be used to optimise the following, which may speed up validation. So replace the below with if (this.valueConstraint === 'UriTemplate' && PropertyHelper.isUrlTemplate(data)) {:

data-model-validator/src/classes/field.js

Lines 162 to 165 in 652c8d9

	// Is this a URL template?
	// This processes most strings... so could be a bit intensive
	if (PropertyHelper.isUrlTemplate(data)) {
	returnType = 'https://schema.org/Text';

"valueConstraint": "UUID"

• Checks that the value is a valid lowercase UUID, and outputs a FAILURE if not. The error message should cite RFC 4122 Section 3, which requires that UUID characters be generated in lower case.