docs: @Override
  	protected boolean isContentType(String schemaId, String schemaVersion, String systemId, String publicId) {
  		if (this.schema == null) {
  			return false;
  		}
  		if (this.regEx != null) {
  			final Matcher matcher = this.regEx.matcher(schemaId);
  			return matcher != null && matcher.find();
  		}
  		return this.schema.equalsIgnoreCase(schemaId);
  	}