public interface Anchor
This is a marker interface for an anchor which can be created either in the Text or Author editing modes
and then used to located the same content in another editing mode (Author or Text).
An Anchor is usually implemented as a simple XPath expression along with a relative offset
to remember the current position inside the current XML element's text content.
You can serialize an Anchor to a string and back using the "ro.sync.exml.workspace.api.options.GlobalOptionsStorage.serializePersistentObject(Object)"
and "ro.sync.exml.workspace.api.options.GlobalOptionsStorage.deserializePersistentObject(Object)" APIs.