proposal: Initial data format proposal for type designer

[clepski]

Do not merge, this is a proposal and the PR is for discussion purposes

Proposals for Type Designer data storing

Relates to #62

• Always append regular element with Type, i.e. for <IED> use <IEDType> and for <Bay> use <BayType>
• Every type should have an id attribute which is used for references
• Store new types under a <Private> field with a suitable identifier in <DataTypeTemplates>

<SCL>
    ...
    <DataTypeTemplates>
        <Private name="TBD">
            <BayType description="BusBar">
                ...
            </BayType>
            <IEDType description="Relay">
                ...
            </IEDTYpe>
        </Private>
    </DataTypeTemplates>
</SCL>

• If a parent element references children by type, it should be done by type reference like it is done in the templates plugin for logical node types down to DO and DA elements

<DataTypeTemplates>
    <Private name="TBD">
        <BayType description="BusBar">
            <IED name="Protection A" type="IED_protection_type" />
            <IED name="Protection B" type="IED_protection_type" />
            <IED name="Measurement B" type="IED_measurement_type" />
        <BayType>
        <IEDType id="IED_protection_type">
            ...
        </IEDType>
        <IEDType id="IED_measurement_type">
            ...
        </IEDType>
    </Private>
</DataTypeTemplates>

Full example

Consider the following type structure

This should result in the following SCD. Take note that the SCD structure is strongly simplified, for example <LDevice> is not a direct child of <IED>. From <LN> downwards the types can already be created in the templates plugin.

<SCL>
    <OtherStuff>...</OtherStuff>
    <DataTypeTemplates>
        <Private name="TBD">
            <BayType description="BusBar">
                <IED name="Protection A" type="IED_protection_type" />
                <IED name="Protection B" type="IED_protection_type" />
                <IED name="Measurement B" type="IED_measurement_type" />
            <BayType>
            <IEDType id="IED_protection_type">
                <LDevice name="Supervision" type="LDevice_supervision" />
                <LDevice name="ProtInputs" type="LDevice_protection_inputs" />
            </IEDType>
            <IEDType id="IED_measurement_type">
                <LDevice name="ProtInputs" type="LDevice_protection_inputs" />
            </IEDType>
            <LDeviceType id="LDevice_supervision">
                <LN0 desc="ComSupervision_GOOSE/LLN0/LLN0" inst="" lnClass="LLN0" lnType="SIPROTEC5_LNType_LLN0_LDevice_Generic">
                </LN0>
            </LDeviceType>
            <LDeviceType id="LDevice_protection_inputs">
                <LN0 desc="Ln1_AnalogueDis_OC_SOTF/LLN0" inst="" lnClass="LLN0" lnType="SIPROTEC5_LNType_LLN0_LDevice_Generic">
                </LN0>
            </LDeviceType>
        </Private>
        <LNodeType id="SIPROTEC5_LNType_LLN0_LDevice_Generic" lnClass="LLN0">
            <DO name="Beh" type="SIPROTEC5_DOType_ENS_Behavior_V07.80.17_V02.00.00"/>
            <DO name="Health" type="SIPROTEC5_DOType_ENS_Health_V07.80.17_V02.00.00"/>
        </LNodeType>
    </DataTypeTemplates>
</SCL>