The same table 'name' cannot be the child table in two nested relations

问题

Several time already asked here and there, some answers relate to old VS versions (this on is using V.S. 2012).

I present the problem again:

given an xsd:

<xs:schema elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">

    <xs:complexType name="LocationType">
        <xs:attribute name="X" type="xs:integer" />
        <xs:attribute name="Y" type="xs:integer" />
    </xs:complexType>

    <xs:complexType name="AlphaNumericType">
        <xs:sequence>
            <xs:element name="AlphaNumericLocation" type="LocationType" />
        </xs:sequence>
        <xs:attribute name="id" type="xs:string" />
        <xs:attribute name="key" type="xs:integer" />
    </xs:complexType>

 <xs:complexType name="BitmapType">
            <xs:sequence>
                <xs:element name="BitmapLocation" type="LocationType" />
                <xs:element name="BitmapCaptions" type="AlphaNumericType" />
            </xs:sequence>
            <xs:attribute name="key" type="xs:string" />
            <xs:attribute name="id" type="xs:string" />
        </xs:complexType>

    <xs:complexType name="ArcType">
            <xs:sequence>
                <xs:element name="ArcLocation" type="LocationType" />
                <xs:element name="ArcCaptions" type="AlphaNumericType" />
            </xs:sequence>
            <xs:attribute name="key" type="xs:string" />
            <xs:attribute name="id" type="xs:string" />
        </xs:complexType>


    <xs:element name="BitmapControls">
        <xs:complexType>
            <xs:sequence minOccurs="0" maxOccurs="unbounded">
                <xs:element name="Bitmap" type="BitmapType" />
            </xs:sequence>
        </xs:complexType>
    </xs:element>

    <xs:element name="ArcControls">
        <xs:complexType>
            <xs:sequence minOccurs="0" maxOccurs="unbounded">
                <xs:element name="Arc" type="ArcType" />
            </xs:sequence>
        </xs:complexType>
    </xs:element>
</xs:schema>

Notice - that AlphaNumeric has a location element, and both bitmap and arc has AlphaNumeric.

When I create a cs class (using XSD tool) and try to instantiate it I get this error:

The same table 'AlphaNumericLocation' cannot be the child table in two nested relations.

How can I overcome this issue ? (the real xsd is more complicated and has a lot more "related similar" children.....

I want to use the xml data in my app in a typed dataset (which easily read and parse the xml). and I can easily bind tables and columns to other controls... (grid)

回答1:

Microsoft's XML parser does not support this: I don't think it's changed since early versions of VS.

Check here for some hints on what to do instead: http://social.msdn.microsoft.com/Forums/en-US/22f98352-83b9-4638-a306-34a36a11e4d6/the-same-table-choice-cannot-be-the-child-table-in-two-nested-relations

回答2:

I have posted a workaround for this problem. Obviously it may not be a solution for every one, but at least it explains the source of the problem an points a finger to the offending code.

Serialization Issue when using WriteXML method

Also, you should use 'nesting' in your schema, that will fix the problem.

I have problems adapting your schema, so you'll have to try yourself, but I have adapted one of my own. It's a DataSet with two tables, where MyRootTable has a nested relation with 'PremiumPerYear'.

The key player in this nested relation is the <xs:choice element. It allows (I believe) the schema to reference another part of itself. This reference is then created/used by the 'ref' keyword: <xs:element ref="PremiumPerYear" />

Note: this example does not have an actual 'double nested' relation, but that's just because I cut 90kb of text out. <DataSet> <xs:schema id="NewDataSet" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata" xmlns:msprop="urn:schemas-microsoft-com:xml-msprop"> <xs:element name="PremiumPerYear"> <xs:complexType> <xs:sequence> <xs:element name="BeforeTaxes" type="xs:decimal" minOccurs="0" /> <xs:element name="AfterTaxes" type="xs:decimal" minOccurs="0" /> </xs:sequence> </xs:complexType> </xs:element> <xs:element name="NewDataSet" msdata:IsDataSet="true" msdata:UseCurrentLocale="true"> <xs:complexType> <xs:choice minOccurs="0" maxOccurs="unbounded"> <xs:element ref="PremiumPerYear" /> <xs:element name="MyRootTable"> <xs:complexType> <xs:sequence> <xs:element name="RequestType" msprop:KeyValueCategory="KindOfRequest" type="xs:string" minOccurs="0" /> <xs:element name="RequestDateTime" type="xs:dateTime" minOccurs="0" /> </xs:sequence> </xs:complexType> </xs:element> </xs:choice> </xs:complexType> </xs:element> </xs:schema> </DataSet>

来源：https://stackoverflow.com/questions/17925858/the-same-table-name-cannot-be-the-child-table-in-two-nested-relations

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xml

xsd