CODEWITHSUNDEEP
xmlxsdxsd-validationxml-validation
Tschenser
Tschenser

Reputation: 447

Can xsd:sequences be nested as subsequences?

I would like to know if it is valid (I assume so) to have a sequence within a sequence and if so, what would be the (intended) benefit from this.

The reason I'm asking is that I'm currently try to setup an interface that outputs a tax file specific to Poland. For those interested, here's the full XSD, however I just refer to the "interesting" parts here:

<xsd:complexType>
    <xsd:sequence>
        <xsd:element name="LpSprzedazy" type="tns:TNaturalnyJPK">
            <xsd:annotation>
                <xsd:documentation>Lp. wiersza ewidencji sprzedaży VAT</xsd:documentation>
            </xsd:annotation>
        </xsd:element>
        <!-- lots of other elements -->
        <xsd:element name="K_14" type="tns:TKwotowy" minOccurs="0">
            <xsd:annotation>
                <xsd:documentation>Kwota netto - w tym dostawa towarów, o której mowa w art. 129 ustawy</xsd:documentation>
            </xsd:annotation>
        </xsd:element>
        <xsd:sequence minOccurs="0">
            <xsd:element name="K_15" type="tns:TKwotowy">
                <xsd:annotation>
                    <xsd:documentation>Kwota netto - Dostawa towarów oraz świadczenie usług na terytorium kraju, opodatkowane stawką 5%</xsd:documentation>
                </xsd:annotation>
            </xsd:element>
            <xsd:element name="K_16" type="tns:TKwotowy">
                <xsd:annotation>
                    <xsd:documentation>Kwota podatku należnego - Dostawa towarów oraz świadczenie usług na terytorium kraju, opodatkowane stawką 5%</xsd:documentation>
                </xsd:annotation>
            </xsd:element>
        </xsd:sequence>
        <!-- two other sequences like the one for "K_15" and "K_16" above-->
        <xsd:element name="K_21" type="tns:TKwotowy" minOccurs="0">
            <xsd:annotation>
                <xsd:documentation>Kwota netto - Wewnątrzwspólnotowa dostawa towarów</xsd:documentation>
            </xsd:annotation>
        </xsd:element>
        <!-- lots of other elements -->
    </xsd:sequence>
    <xsd:attribute name="typ" use="required" fixed="G"/>
</xsd:complexType>

My question are:

  1. Is a sequence within a sequence (without any hierarchical node like element or complex type) allowed?
  2. What sense does it make to have elements K_15 and K_16 as an sequence. Is it because it would be allowed to omit both but not individually?

Upvotes: 1

Views: 597

Answers (1)

kjhughes
kjhughes

Reputation: 111688

  1. Yes, xsd:sequence elements can be nested in XSD.
  2. Yes, K_15 and K_16 in your shown XSD are collectively optional due to the minOccurs="0" on the parent xsd:sequence.

Another useful subsequence pattern is when maxOccurs is greater than 1, indicating that the subsequence of elements may repeat together.

Upvotes: 2

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