changes

...main/java/info/textgrid/middleware/DublinCoreBuilder.java

.../java/info/textgrid/middleware/DublinCoreFieldLoader.java

...a/info/textgrid/middleware/IdentifierListDelivererDC.java

...info/textgrid/middleware/MetadataFormatListDeliverer.java

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

.../src/main/java/info/textgrid/middleware/OAI_ESClient.java

...main/java/info/textgrid/middleware/RecordDelivererDC.java

...n/java/info/textgrid/middleware/RecordDelivererIDIOM.java

.../java/info/textgrid/middleware/RecordListDelivererDC.java

oaipmh-core/src/main/java/info/textgrid/middleware/Rest.java

.../src/main/java/info/textgrid/middleware/SetDeliverer.java

oaipmh-core/src/main/xsd/oai_pmh.xsd

...re/src/test/java/info/textgrid/middleware/OaiPmhTest.java