Change anchor to be string value & create more files when necessary
Add some methods for easier use
Create ORDERLABEL attribute on export & add getter for meta data
Make read & write functions work with multiple anchor files
Rename sort title accordingly
Fixed an NPE
Use appropriate anchor class
Make reading work
Override toString() for DocStruct
Get all childs' MODS sections
Recursive implementation of getChild()
Get reading of logical structure to work
Check if an anchorIdentifier was written only for traditional hierarchy
Fix NullPointerException
Pass DigitalDocument as parameter
Get anchor classes & get only real successors
Add import into metadata group
Merge pull request #1 from matthias-ronge/issue_59

Merge: [ZM] Generieren von Supraankern (#59)
Merge pull request #3 from matthias-ronge/issue_169_2

Merge:  Add metadata grouping (#169)
Export ordinary file groups only