Merge branch 'develop' into 'main'

...tgrid/middleware/MetadataFormatListDelivererAbstract.java

...fo/textgrid/middleware/MetadataFormatListDelivererTG.java

...c/main/java/info/textgrid/middleware/OaipmhConstants.java

...re/src/main/java/info/textgrid/middleware/OaipmhImpl.java

oaipmh-core/src/main/resources/bindings.xjb

oaipmh-core/src/main/resources/oaf-1.0.xsd

oaipmh-core/src/main/resources/oaf-common-1.0.xsd

oaipmh-core/src/main/resources/oaf-datasource-1.0.xsd

oaipmh-core/src/main/resources/oaf-org-1.0.xsd

oaipmh-core/src/main/resources/oaf-project-1.0.xsd

oaipmh-core/src/main/resources/oaf-result-1.0.xsd

pom.xml