Peppol 3.0 BR-64 : The Item standard identifier (BT-157) shall have a Scheme identifier.

[dragonfly4]

The Item standard identifier (BT-157) shall have a Scheme identifier.
https://docs.peppol.eu/poacc/billing/3.0/rules/ubl-tc434/BR-64/

Context
cac:InvoiceLine/cac:Item/cac:StandardItemIdentification/cbc:ID | cac:CreditNoteLine/cac:Item/cac:StandardItemIdentification/cbc:ID

Test
exists(@schemeID)

Usage
/ ubl:Invoice / cac:InvoiceLine / cac:Item / cac:StandardItemIdentification / cbc:ID
/ ubl:CreditNote / cac:CreditNoteLine / cac:Item / cac:StandardItemIdentification / cbc:ID

Add attributes for the setStandardItemIdentification function.
Extension of PR #55

Code Example

$productItem = (new \NumNum\UBL\Item)
->setStandardItemIdentification('874512958741', [ 'schemeID' => '0088' ]);

XML result

<cac:StandardItemIdentification>
    <cbc:ID schemeID="0088">874512958741</cbc:ID>
/cac:StandardItemIdentification>

schemeID value should come from the ICD list
https://docs.peppol.eu/poacc/billing/3.0/codelist/ICD/