Errors in the ZUGFeRD Specification Part 1

Incoherent date formats

Lets take a look at chapter 6.5.3 of the ZUGFeRD format specification. The chapter defines the two date formats in ZUGFeRD. One where the date string is accompanied by a format code and another one described only as a string. The last one did not exist in the RC Specification.

Following questions arise

UN/EDIFACT 2379 - Date or time or period format code specifies around 80 different date formats. Should all formats be allowed in ZUGFeRD or only the named 102, 610 and 616? Furthermore UN/EDIFACT 2379 also defines periods.
IssueDateTime is defined in the specification as yyyy-MM-ddTHH:mm:ss (Example: 2013-08-05T00:00:00). The XSD on the other hand is a union of dateTime or date.
```
<xs:simpleType name="DateMandatoryDateTimeType">
	<xs:union memberTypes="xs:dateTime xs:date"/>	(1)
</xs:simpleType>
```
1 This means that yyyy-MM-ddTHH:mm:ss and yyyy-MM-dd are both valid types which is not clear from the specification.

Incorrect XSD

DefinedTradeContact

The DefinedTradeContact within a TradePartyType is defined with an unbound occurrence. According to the specification it should occur maximum one time.

<xs:complexType name="TradePartyType">
	<xs:sequence>
		<xs:element name="ID" type="udt:IDType" minOccurs="0" maxOccurs="unbounded"/>
		<xs:element name="GlobalID" type="udt:IDType" minOccurs="0" maxOccurs="unbounded"/>
		<xs:element name="Name" type="udt:TextType" minOccurs="0"/>
		<xs:element name="DefinedTradeContact" type="ram:TradeContactType" minOccurs="0" maxOccurs="unbounded"/>	(1)
		<xs:element name="PostalTradeAddress" type="ram:TradeAddressType" minOccurs="0"/>
		<xs:element name="SpecifiedTaxRegistration" type="ram:TaxRegistrationType" minOccurs="0" maxOccurs="unbounded"/>
	</xs:sequence>
</xs:complexType>

1	Correct should be maxOccurs="1"

NoteType

Model and Schema definition declare ContentCode as optional and with a max occurrence of one.

Figure 1. Model definition page 7.

Figure 2. Schema description page 50.

<xs:complexType name="NoteType">
	<xs:sequence>
		<xs:element name="ContentCode" type="udt:CodeType" minOccurs="0" maxOccurs="unbounded"/>	(1)
		<xs:element name="Content" type="udt:TextType" minOccurs="0" maxOccurs="unbounded"/>
		<xs:element name="SubjectCode" type="udt:CodeType" minOccurs="0"/>
	</xs:sequence>
</xs:complexType>