diff --git a/pylot/core/readdata/types.py b/pylot/core/readdata/types.py
index 811d8f6f..bef1ba45 100644
--- a/pylot/core/readdata/types.py
+++ b/pylot/core/readdata/types.py
@@ -14,11 +14,36 @@ class GenericDataBase(object):
 	base working on.
 	'''
 	def __init__(self, stexp=None, **kwargs):
+		dbRegExp = {
+					
 		structExpression = os.path.split(stexp)
-		self.dataBaseDict = kwargs 
+		self.dataBaseDict = kwargs
 		
 				
 		
 
 class SeiscompDataStructure(GenericDataBase):
-	pass
+	# Data type options
+	typeOptions = {'waveform':'D', #Waveform data
+				   'detect':'E', #Detection data
+				   'log':'L', #Log data
+				   'timing':'T', #Timing data
+				   'calib':'C', #Calibration data
+				   'resp':'R', #Response data
+				   'opaque':'O' #Opaque data
+				   }
+	# SDS fields' default values
+	# definitions from 
+	# http://www.seiscomp3.org/wiki/doc/applications/slarchive/SDS
+	sdsFields = {'SDSdir':['data','SDS'], #base directory list
+				 'YEAR':'1970', #4 digits
+				 'NET':'XX', #up to 8 characters
+				 'STA':'XXXX', #up to 8 characters
+				 'CHAN':'HHZ', #up to 8 characters
+				 'TYPE':typeOption['waveform'], #1 character
+				 'LOC':'', #up to 8 characters
+				 'DAY':'001' #3 digit day of year
+				 }
+	def __init__(self, **kwargs):
+
+