1 INTRODUCTION
2 DATA SETS AND SPECTROSCOPIC TARGET SELECTION IN XMM-XXL NORTH
2.1 Introduction of imaging data sets
2.2 Cross-matching of data sets
2.3 Spectroscopic data set
3 SPECTROSCOPIC REDSHIFT AND CLASSIFICATION OF AGN
3.1 BOSS pipeline products
3.2 Redshift determination
3.3 Spectroscopic Classification
3.4 Final classified sample
4 CLASS PROPERTIES
4.1 BLAGN1
4.2 NLAGN2 and NLAGN2cand
4.3 eAGN-ALG and eAGN-SFG
5 ASSESSMENT OF OPTICAL AND MID-IR AGN COLOUR SELECTION TECHNIQUES
5.1 Optical: XDQSO targeting algorithm
5.2 Infrared: WISE colour selection
6 DISCUSSION
6.1 Understanding the AGN population in the XMM-XXL north
6.2 Uniqueness of X-ray AGN selection
7 EROSITA AND SPIDERS FORECAST
7.1 Spectroscopic completeness
7.2 X-ray detection fraction of XDQSO and WISE selected AGN
8 CONCLUSIONS