UA-.NETStandard

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Sebastian Baeumler ea1e2b35db Fixed issue with XML namespace schema while decode an XML nodeset (#1385 )

- added protected property XmlNamespace to BaseComplexType class
- use XmlNamespace instead of TypeId.NamespaceUri for PushNamespace of
  encoder/decoder
- adapt Encode/Decode method in OptionalFieldsCompexType and
  UnionComplexType class

Change was needed if Xml schema in Xml nodeset differ from the custom OPC UA namespace. 
Only effects XML encoding and decoding from values of customized structured datatypes.

Example:

The OPC UA Namespace of the nodeset is http://MyTestOfExtensions but the xml namespace for the xml schema is http://MyTestOfExtensions/Types.xsd
These 2 namespaces are not forced to be equal, therefor the XmlDecoder need to Push the XmlNamespace for the schema to the Reader stack. Otherwise the ExtensionObject Body will not be read.

```XML
<?xml version="1.0" encoding="utf-8"?>
<UANodeSet LastModified="2021-04-08T11:57:22.286Z" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://opcfoundation.org/UA/2011/03/UANodeSet.xsd" xmlns:uax="http://opcfoundation.org/UA/2008/02/Types.xsd" xmlns:si="http://www.siemens.com/OPCUA/2017/SimaticNodeSetExtensions" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <NamespaceUris>
        <Uri>http://MyTestOfExtensions</Uri>
    </NamespaceUris>
    <Models>
        <Model ModelUri="http://MyTestOfExtensions" PublicationDate="2020-07-20T00:00:00Z" Version="1.00">
            <RequiredModel ModelUri="http://opcfoundation.org/UA/" PublicationDate="2020-07-15T00:00:00Z" Version="1.04.7"/>
        </Model>
    </Models>
    <Aliases>
        <Alias Alias="Boolean">i=1</Alias>
        <Alias Alias="DateTime">i=13</Alias>
        <Alias Alias="String">i=12</Alias>
        <Alias Alias="NodeId">i=17</Alias>
        <Alias Alias="QualifiedName">i=20</Alias>
        <Alias Alias="HasComponent">i=47</Alias>
        <Alias Alias="HasProperty">i=46</Alias>
        <Alias Alias="Organizes">i=35</Alias>
        <Alias Alias="HasSubtype">i=45</Alias>
        <Alias Alias="HasTypeDefinition">i=40</Alias>
        <Alias Alias="HasModellingRule">i=37</Alias>
        <Alias Alias="HasEncoding">i=38</Alias>
    </Aliases>
    <Extensions>
        <Extension>
            <si:Generator Product="SiOME" Edition="Standard" Version="2.2.3-beta24"/>
        </Extension>
        <Extension>
            <si:GeneratorExtension Hash="cee97a4b7b32c169214c2bbc22b555d2"/>
        </Extension>
    </Extensions>
    <UAObject SymbolicName="http___MyTestOfExtensions" NodeId="ns=1;i=5000" BrowseName="1:http://MyTestOfExtensions" ParentNodeId="i=11715">
        <DisplayName>http://MyTestOfExtensions</DisplayName>
        <References>
            <Reference ReferenceType="HasComponent" IsForward="false">i=11715</Reference>
            <Reference ReferenceType="HasTypeDefinition">i=11616</Reference>
        </References>
    </UAObject>
    <UAVariable DataType="String" NodeId="ns=1;i=6002" BrowseName="NamespaceUri" ParentNodeId="ns=1;i=5000">
        <DisplayName>NamespaceUri</DisplayName>
        <References>
            <Reference ReferenceType="HasProperty" IsForward="false">ns=1;i=5000</Reference>
            <Reference ReferenceType="HasTypeDefinition">i=68</Reference>
        </References>
        <Value>
            <uax:String>http://MyTestOfExtensions</uax:String>
        </Value>
    </UAVariable>
    <UADataType NodeId="ns=1;i=3000" BrowseName="1:MyStructureType">
        <DisplayName>MyStructureType</DisplayName>
        <References>
            <Reference ReferenceType="HasSubtype" IsForward="false">i=22</Reference>
            <Reference ReferenceType="HasEncoding">ns=1;i=5001</Reference>
            <Reference ReferenceType="HasEncoding">ns=1;i=5002</Reference>
        </References>
        <Definition Name="1:MyStructureType">
            <Field DataType="i=17" Name="NodeId"/>
            <Field DataType="i=20" Name="QualifiedName"/>
        </Definition>
    </UADataType>
    <UAObject SymbolicName="DefaultBinary" NodeId="ns=1;i=5001" BrowseName="Default Binary">
        <DisplayName>Default Binary</DisplayName>
        <References>
            <Reference ReferenceType="HasTypeDefinition">i=76</Reference>
        </References>
    </UAObject>
    <UAObject SymbolicName="DefaultXML" NodeId="ns=1;i=5002" BrowseName="Default XML">
        <DisplayName>Default XML</DisplayName>
        <References>
            <Reference ReferenceType="HasTypeDefinition">i=76</Reference>
        </References>
    </UAObject>
    <UAVariable DataType="ns=1;i=3000" NodeId="ns=1;i=6021" BrowseName="1:StructureTest" ParentNodeId="i=2253" UserAccessLevel="3" AccessLevel="3">
        <DisplayName>StructureTest</DisplayName>
        <References>
            <Reference ReferenceType="Organizes" IsForward="false">i=2253</Reference>
            <Reference ReferenceType="HasTypeDefinition">i=63</Reference>
        </References>
        <Value>
            <uax:ExtensionObject>
                <uax:TypeId>
                    <uax:Identifier>ns=1;i=5002</uax:Identifier>
                </uax:TypeId>
                <uax:Body>
                    <MyStructureType xmlns="http://MyTestOfExtensions/Types.xsd">
                        <NodeId>
                            <uax:Identifier>ns=1;i=42</uax:Identifier>
                        </NodeId>
                        <QualifiedName>
                            <uax:NamespaceIndex>1</uax:NamespaceIndex>
                            <uax:Name>zweiundvierzig</uax:Name>
                        </QualifiedName>
                    </MyStructureType>
                </uax:Body>
            </uax:ExtensionObject>
        </Value>
    </UAVariable>
</UANodeSet>
```