Draft: relation inside metadata group in refer crosswalk

References

Fixes https://github.com/4Science/DSpace/issues/385 #385 (if this fixes an issue ticket)

Description

extension of refercrosswalk to consider relation inside metadatagroup.

Instructions for Reviewers

Please add a more detailed description of the changes made by your PR. At a minimum, providing a bulleted list of changes in your PR is helpful to reviewers.

List of changes in this PR:

added check/line, if some value is some placeholder if.nullorplaceholder. or if.not.nullorplaceholder
extended group to consider if conditions and to consider relation to other items inside the group.

Some example template considering both changes above configuration might be:

   <Authors>
        @group.dc-contributor-author.start@
            <Author>
                <DisplayName>@dc.contributor.author@</DisplayName>
                @relation.dc-contributor-author.start@
                    <Person id="@virtual.id@">
                        <PersonName>
                            <FamilyNames>@virtual.personName.lastName@</FamilyNames>
                            <FirstNames>@virtual.personName.firstName@</FirstNames>
                        </PersonName>
                        <ORCID>https://orcid.org/@person.identifier.orcid@</ORCID>
                </Person>
                @relation.dc-contributor-author.end@
                @if.not.nullorplaceholder.oairecerif-author-affiliation.start@
                    @relation.oairecerif-author-affiliation.start@
                        <Affiliation>
                            <OrgUnit id="@virtual.id@">
                            @if.metadata.dc-title.start@
                                <Name>@dc.title@</Name>
                            @if.metadata.dc-title.end@
                            @if.metadata.organization-identifier-ror.start@
                                <RORID>@organization.identiifer.ror@</RORID>
                            @if.metadata.organization-identifier-ror.end@
                            @if.metadata.organization-identifier-crossrefid.start@
                                <FundRefID>https://doi.org/10.13039/@organization.identifier.crossrefid@</FundRefID>
                            @if.metadata.organization-identifier-crossrefid.end@
                            </OrgUnit>
                        </Affiliation>
                    @relation.oairecerif-author-affiliation.end@
                @if.not.nullorplaceholder.oairecerif-author-affiliation.end@
            </Author>
        @group.dc-contributor-author.end@
    </Authors>

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Checklist

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[ ] My PR is small in size (e.g. less than 1,000 lines of code, not including comments & integration tests). Exceptions may be made if previously agreed upon.
[ ] My PR passes Checkstyle validation based on the Code Style Guide.
[ ] My PR includes Javadoc for all new (or modified) public methods and classes. It also includes Javadoc for large or complex private methods.
[ ] My PR passes all tests and includes new/updated Unit or Integration Tests based on the Code Testing Guide.
[ ] If my PR includes new libraries/dependencies (in any pom.xml), I've made sure their licenses align with the DSpace BSD License based on the Licensing of Contributions documentation.
[ ] If my PR modifies REST API endpoints, I've opened a separate REST Contract PR related to this change.
[ ] If my PR includes new configurations, I've provided basic technical documentation in the PR itself.
[ ] If my PR fixes an issue ticket, I've linked them together.

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