Parse XML against CrossRef Schema
Schema declarations in your XML
This test parser requires the following schema declaration:
<?xml version="1.0" encoding="UTF-8"?>
<doi_batch version="4.3.0" xmlns="http://www.crossref.org/schema/4.3.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.crossref.org/schema/4.3.0
http://www.crossref.org/schema/deposit/crossref4.3.0.xsd">
To use other versions of the schema simply replace the 4.3.0 accordingly. Schema details are available in CrossRef Help.
Schematron-based Metadata Quality Check (Schema v. 4.3.0)