This interface is implemented according to the specification of
service Content.
A DCP Folder can create other DCP Folders and DCP Documents. To create
a new child of a PCP Folder:
Let the parent folder create a new content by calling
XContentCreator::createNewContent on it. The content
type to use for new folders is
"application/vnd.sun.star.webdav-collection". To create a new DCP
Document, use the type "application/http-content".
Set a title at the new folder / document. ( Let the new child execute
the command "setPropertyValues", which sets at least the property
"Title" to a non-empty value ).
Let the new child ( not the parent! ) execute the command "insert".
This will commit the creation process and persist the newly created
content on the server. For documents, you need to supply the
implementation of an ::com::sun::star::io::XInputStream
with the command's parameters, that provides access to the stream data.