Integration via API

[nuest]

There are different ways to integrate the label into metadata documents. To make sure only one way is used the integration could be done within the server. The existing API would be extended with a parameter integrate with the following allowed values and responses:

• reference: instead of a label the original metadata document is returned and a reference to the label is inserted into the document
• inline: instead of a label the original metadata document is returned and a label is inserted inline into the document.