short-term goal - support in a single place calibration data for detectors moving across LCLS experiments.
perspective goal long-term goal - calibration store for LCLS-II.

It is assumed that hardware Hardware configuration of modern detectors will detector can be associated with configuration index coming from DAQunique index hardwired on detector controller chip. This index will be used to recognize detector and extract hardly retrievable calibration data such as parameters for geometry, gain factors, masks etc. in case of transition of the detector from one experiment to another.

Requirements

Instrument independent - detector can be moved between instruments and hatches. / Experiment independent - detector can be moved between experiments, hatches, and instruments.
Portability - calibration data for particular detector should be portable as a self consistent file or (part of) calibration directory.
API + Interfaces - API, Command Line (CL), GUI for central management; management can ONLY be done through the API/CL/GUI in order to prevent adding/removing unknown files without history.
Time stamp (sec) - is THE ONLY value for validity range check; the same rules are applied to the time stamp , like for to the run number in current calibration system.
The <detname> is equivalent to File name - the <detname> in the calibration store is <dettype>-<detid> and is THE ONLY choice for the file name in the calibration store.
Aliases to the calibration file names and specific data can be used to simplify access.
Support calibration versionsVersions - support versions of calibration data.
Support links Links to predecessor and successor - support access to predecessor and successor if this info is available.

Architecture

To accommodate requirements calibration store Detector Calibration Store (DCS) suppose to be implemented as a combination of FS & DB file system (FS) and data base (DB) files (hdf5 for uniformity).

Calibration directory and files

Default calibration directory in LCLS FS

instrument and experiment-independent path

/reg/g/psdm/detector/calib

in contrast to the current instrument and experiment-dependent path

/reg/d/psdm/<INS>/<experiment>/calib

In local space

define calib path

<path>/calib/
assuming further structure of the calibration directory <dettype>/<dettype>-<detid>.h5

or use detector calibration file directly

<path>/<dettype>-<detid>.h5

Structure of calibration directory

Everything in lower case:

Code Block

<path>/calib/
             <dettype>/
             cspad2x2/
             pnccd/
             epix100a/
             cspad/
                       <files>
                       <aliases1>.als           # file with a map of aliases to detector names
                       ...
                       <aliasesN>.als           # one of these files can be used to map "sources" to detector names
                       <dettype>-<detid>.h5
                       <dettype>-<detid>.h5

Detector type <dettype> is used as a folder to organize files under the calib directory. In case of direct access to the hdf5 file the detector type is duplicated in the name of the file. Unique part of the detector name <detid> is used to assign calibration file to the particular detector version. If the detector is changing the new calibration file is created with new <detid>. Information about predecessor and successor (if available) can be saved under the root level of the calibration file. Current sources (ex: 'Camp.0:pnCCD.1' ) should be presented in the dictionary of aliases.

Calibration file structure

Calibration data hierarchical scheme

Access to calibration data is based on time stamp. Time stamp internally is presented in Unix time sec which can be easily converted forth and back to human readable format YYYY-MM-DDTHH:MM:SS+HH:MM

The scheme of the calibration data, which presumably will be implemented in <dettype>-<detid>.h5

Functionality of the DCS from bottom to top level can be listed as follows.

All calibration constants for particular detector id (detid - index of the detector version) will be kept in a single hdf5 file named as <dettype>-<detid>.h5
- Schema of this file contains a few levels which account for constant types, time stamp ranges, versions of constants.
- Beside main functionality each level contains dictionary of parameters and dictionary of history records.
These files are grouped in the directory for detector type; ex.: cspad, cspad2x2, pnccd, etc.
- The same directory contains files with aliases <aliases1>.als which map human readable detector name-and-version with appropriate <dettype>-<detid>.h5 file.
All detector type folders in regular case are collected under calib directory, although it is assumed that calibration files can be used directly.
The calib directory may be nested in three locations;
- repository - experiment-independent space with FS back-up, contains most complete calibration files in terms of time stamp and versions,
- experimental work-space - experiment-dependent space, contains squeezed version of calibration files with time stamp and versions essential for particular experiment,
- local work-space - experiment-independent any local directory, with squeezed files similar to experimental work-space.

The repository and experimental works-pace have predictable location in the file system, local work-space may have an arbitrary path. Direct file access pick up calibration file from any place.

Two-levels of interaction with DCS:
- interaction with calibration data in particular calibration file,
  - add/get/remove constants for type, time stamp, version, etc.
  - add/remove/edit metadata.
- data exchange between files between repository, experimental and local work-spaces.
  - file difference
  - transfer constants for type, time stamp, version, etc.
- - use web-service mechanism
Access Control Lists (ACL) depends on file location and is assumed to be
- repository - limited to dedicated persons
- experimental work-spaces - members of experimental group
- local work-spaces - all

Calibration directory and files

Repository

instrument and experiment-independent path to calibration directory and file

<PATH>/detector/calib/
<dettype>/<dettype>-<detid>.h5

Experiment calibration directory

experiment-dependent path to calibration directory and file

<PATH>/<INS>/<experiment>/calib/
<dettype>/<dettype>-<detid>.h5

Local calibration directory

local calib path to calibration directory and file

<path-to-calib>/calib/
<dettype>/<dettype>-<detid>.h5

Direct path to calibration file

direct path to calibration file

<path-to-calib>/<dettype>-<detid>.h5

Structure of calibration directory

Everything in lower case:

Code Block

<path-to-calib>/calib/                          # top calib directory
             <dettype>/                         # detector type folders
             cspad2x2/
             pnccd/
             epix100a/
             cspad/
                       <files>                  # level of files
                       <aliases1>.als           # file with a map of aliases to detector names
                       ...
                       <aliasesN>.als           # one of these files can be used to map "sources" to detector names
                       <dettype>-<detid>.h5     # files with detector-dependent calibration data
                       <dettype>-<detid>.h5

The calib directory is a top level DCS directory.
Detector type <dettype> folders are used to organize files under the calib directory. In case of direct access to the hdf5 file the detector type is duplicated in the name of the file.
Unique part of the detector name <detid> is used to assign calibration file to the particular detector hardware configuration version. If the detector hardware configuration is changing a new calibration file is created with new <detid>.
Information about predecessor and successor (if available) can be saved under the root level of the calibration file.
Current sources (ex: 'Camp.0:pnCCD.1' ) could be presented in the dictionary of aliases.

Calibration file structure

Calibration data hierarchical scheme

Access to calibration data is based on time stamp. Time stamp internally is presented in Unix time sec which can be easily converted forth and back to human readable format YYYY-MM-DDTHH:MM:SS+HH:MM

The schema (structure) of the DCS files <dettype>-<detid>.h5

Code Block

DCStore  DCType                   DCRange         DCVersion    

/                                                                   # top-root-level contains info for the unique detector version
 dettype (str)

Code Block

/                 # detector type name, ex: cspad, pnccd, etc
 detid (str)                                         # top-root-level contains info for the               # unique detector versionid, ex: 01234
 dettypetscfile (strfloat)                                                      # detectortime typestamp name,of ex:creation cspad,of pnccd,this etcstructure
 detidpredecessor (str)                                                  # name of the previous detector #if uniqueavailable detector id, ex: 01234or None
 tscfilesuccessor (uintstr)                                                    # #name of timethe stampnext ofdetector creationif ofavailable thisor structureNone
 predecessordictpars (strdict)                                                    # namedictionary of theparameters previousassociated detectorwith ifthis availableversion orof Nonedetector
 successorhistory (strdict)                                                     # name of thedictionary nextof detectorhistory ifrecords availablepaired or None
 tags (dict)as (tstamp:record)
 <ctype>/                                                           # dictionaryfolder offor tagscalibration associated with this version of detector
 <ctype>/type, ex.: pedestals, rms, mask, etc
          ctype   (str)                                               # folder for calibration type name
          ctypedictpars (strdict)                                           # dictionary of parameters associated #with calibration type name
          tagshistory (dict)                                               # dictionary of tagshistory associatedrecords withpaired calibration typeas (tstamp:record)
          <tstamp-range>/                                           # folder for time stamp validity range
          <tstamp>[-<tstamp-end>]/                                  # folder for validity range. If <tstamp-end> is not specified - then valid to the end
                                  tsbegin (uintfloat)                    # time stamp for the beginning of the validity range
                                  tsend (uintfloat)                      # time stamp for the end of the validity range
                                  defaultv                          # reference to the default calibration, ex:  <vers-tstamp2>
                                  tagsdictpars (dict)                   # dictionary of parameters associated with validity range
                                  history (dict)                    # dictionary of tagshistory associatedrecords withpaired validity rangeas (tstamp:record)
                                  <vers-tstamp1>/                   # folder for version created on tstamp1
                                                 tsvers (uintfloat)      # tstamp1 of this version production 
                                                 calib (ndarray)    # calibration data
                                                 history (strdict)     # #dictionary productionof history records paired as (tstamp:record)
                                                  tagsdictpars (dict)        # dictionary of tagsparameters, 
                                                                    #   ex: array size, number of dimensions, shape, data type, experiment, run, comments, author

                                  <vers <vers-tstamp2>/                   # folder for version created on tstamp2
                                                 tsvers (uintfloat)
                                                 calib (ndarray)
                                                 history (strdict)
                                                 tagsdictpars (dict)
           <tstamp2>[-<tstamp2-end>]/                               # folder for the next validity range.
 pedestals/                                                         # folder for the next calibration type, pedestals
 rms/                                                               # folder for the next calibration type, rms

...

Schema features

Detector name consists of a common part <dettype> part <dettype> and unique part <detid>.
Alias to the detector name should be kept in separate dictionary outside the file scheme.
Each detector may have optional predecessor, successor, and other tags parameters kept in the dictionary of parameters.
Calibration type folders contain info about calibrations of particular type, ex: pedestals, rms, status, mask, background, etc.
Each calibration type contains a set of time stamp ranges defining calibration validity range. If the second time stamp of the range is missing it is considered as infinity (by the end).
The time stamp range folder contains tstamp_begin, tstamp_end (int) values, dictionary of tags parameters associated with this folder, reference to the default calibration, and folders with calibration versions, distinguished by there production time stamp.
The number of calibration versions for each time stamp range is not limitedunlimited. Default calibration is defined by the reference default _ version defaultv.

Metadata in

...

dictpars

Below are the lists of metadata fields which potentially can be used to define detector configuration, calibration parameters etc.

Detector metadata

Field name	Description	More details, example
dettype	detector type	CSPAD, CSPAD2X2, EPIX100A, etc.
detname	detector unique name	(if any) ex.: Camera1
detalias	alias name	if it is hard to memorize the entire name, ex.: 'cspad1'
detidx	detector index	integer number which codes the hardware version
detidxalias	symbolic alias of the index	can be used if it is hard to memorize the index integer number
detcompidx:001	list of component indexes	just in case if we are going to retrieve calibration parameters for separate components
detidxprev	detector index for previous version	detector index for previous version (if available) for the purpose of old calibration search
detidxnext	detector index for next version	detector index for next version (if available) for the purpose of new calibration search
dettsec	time-stamp	time stamp associated with beginning of the validity range for new configuration
detcom:001	comments for this hardware version	as it says {key:comment}

dettag

detpar:001

other

Calibration parameters' metadata

Field name	Description	More details, example
calibtype	calibration type	ex.: geometry, pixel_status, pixel_gain, pedestals, common_mode, etc.
tsec	time stamp	beginning of the validity range
exp	original experiment	(if available) where calibration constants were obtained
runnum	original run number	(if available) where calibration constants were obtained
runbegin	begin run number	(if available) for validity range
runend	end run number	(if available) for validity range
source	original DAQ data source	data source from DAQ, ex.: 'CxiDs2.0:Cspad.0'
srcalias	data source alias	ex.: 'cspad'
calibvers	version

tag

par	in order to access using symbolic name or some alias
calibversalias	version alias	if it is hard to memorize version

tag

par
com:001	comments for this version	as it says {key:comment}

tag

par:001

other

n-d array metadata

Field name	Description	More details, example

dtype

DTYPE

(str) data type

int, float, double, etc.

ndims

NDIMS

(int) number of dimensions (N)

as it saysdim

ex.: 3
DIM:1	(int) size of dim.1	ex.

..

: 185

dim

DIM:2

(int) size of dim.2

ex.

..

: 388
...	...	...

dim

DIM:N

(int) size of dim.N

ex.

..

: 2

API

Parameters

dettype (str) - detector type: cspad, cspad2x2, pnccd, fccd, opal, epix100a, etc.

ctype (str) - calibration type: pedestals, status, rms, mask, gain, bkgd, common_mode, geometry

detid (str) - detector unique id number, ex: 123456

detname (str) - detector unique name, combination of <dettype>-<detid>

detalias (str) - detector alias name assigned to the detname

cpath (str) - path to the calibration directory (ex: cpath='<path>/calib') or direct hdf5 file name (ex: cpath='<path>/<detname>-<detid>.h5'). Default calibration directory CPATH_DEF='/reg/g/psdm/detector/calib'.

version (int) - time stamp of the version creation

versind (int) - consecutive version index assigned/mapped to the version production time stamp.

Initialization

, geometry

detid (str) - detector unique id number, ex: 123456

detname (str) - detector unique name, combination of <dettype>-<detid>

detalias (str) - detector alias name assigned to the detname

cpath (str) - path to the calibration directory (ex: cpath='<path>/calib') or direct hdf5 file name (ex: cpath='<path>/<detname>-<detid>.h5'). Default calibration directory CPATH_DEF='/reg/g/psdm/detector/calib'.

version (int) - time stamp of the version creation

versind (int) - consecutive version index assigned/mapped to the version production time stamp.

Initialization

Code Block

# Import
from PSCalib.DCStore import DCStore       # inport DCStore (Detector Calibration Store) object 

# Initialization
REPO = '<PATH>/detector/calib'            # default calib repository

cdir = env.calibDir()

Code Block

# Import
from PSCalib.DCStore import DCStore       # inport DCStore (Detector Calibration Store) object 

# Initialization
CPATH_DEF = '/reg/g/psdm/detector/calib'  # default calib directory
cpath = '<path>/calib'                    # local calib directory
cpath = '<path>/<dettype>-<detid>.h5'     # direct to file
cpath = env.calibDir()                    # '/reg/d/psdm/<INS>/<experiment>/calib' - accept current directory

detname = 'pnccd-12345678'                # standard name includes detector type, dash, and n-digit id number
detname = 'Camera1'                     #  # alias

cs = DCStore(cpath, detname) '<PATH>/<INS>/<experiment>/calib' - accept current directory
path = cdir + <dettype>

fname = '[path/]pnccd-12345678'           # standard #name createsincludes adetector DCStore object.
""" get calibration store object
    Input parameters:
type, dash, and n-digit id number
fname = '[path/]Camera1'        cpath [str] - path to the hdf5 file or calibration directory.# alias

cs = DCStore(fname)                If cpath is a path to hdf5 file -# nextcreates parametera isDCStore ignoredobject.
""" get calibration store object
    Input parameters:
    fname [str] - file name/alias of Ifthe cpath=None - default path is used.
                  If cpath is specified as a path to directory (or default) then detname can be an alias.  
    detname [str] - name/alias of the detector 
"""

UI acess methods

Code Block

ctype = pedestals # status, rms, mask, gain, bkgd, common_mode, geometry, etc
tsp = tstamp parameter to identify constants, which can be retrieved from evt.run() - run number, evt
vers = None # for default or versind or version time stamp.

# generic access method:
obj = cs.get(ctype, tsp, vers)

Base class

Is reserved to support common methods of all project classes. For now it stands for manipulations with tags but not limited to.

detector 
"""

If path is missing - use repository.
If calibration file is not found - throw raise IOError('File %s is not available' % fname)

UI acess methods

Code Block

ctype = pedestals # status, rms, mask, gain, bkgd, common_mode, geometry, etc
tsp = tstamp parameter to identify constants, which can be retrieved from evt.run() - run number, evt
vers = None # for default or versind or version time stamp.

# generic access method:
obj = cs.get(ctype, tsp, vers=None)

Base class DCBase

Is reserved to support common methods of all project classes. For now it stands for manipulations with dictpars but not limited to.

Code Block

o = DCBase()

# acess methods
dictpars = o.dictpars()            # returns (dictpars) dictionary of dictpars associated with each object
par  = o.par(k)                    # returns par value for key k
log  = o.history(fmt)

Code Block

DCBase - base class for this project
====================================
tags = obj.tags()          # returns (str) history records preceded by the time #stamp (dictdefault fmt='%Y-%m-%dT%H:%M:%S%Z') dictionaryas ofa tagstext associated
d with each object
tag  = objo.taghistdict(k)                # returns #(dict) returnshistory tagdictionary valueassociated forwith keycurrent k

objobject

# management methods
o.set_tagsdictpars(d)                    # set (dictd) dictionary of tagsparameters for object
objo.add_tagpar(k,v)                     # add (k,v) tagpar to the dictionary of tagsparameters for object
objo.del_tagsdictpars()                     # delete all tagsparameters from the dictionary
obj.del_tag(k)o.del_par(k)                       # delete par with key k
o.set_history(d)                   # set (dict) as a history dictionary of the current object
o.add_history(rec, ts)      # delete tag with key k

Access methods

Code Block
DCStore # add (str) record with (float) time stamp to the history dictionary (ts:rec). If ts is None - call current time is used as a key.

Class DCStore

Code Block

cs = DCStore(cpath, detnamemethods
===============
tscfile     = cs.tscfile()               # (int) time stamp of the file creation
dettype     = cs.dettype()       # (str) path to calib directory or  #file, (str) detector typename

detid# acess   methods
nda   = cs.detid()              get(ctype, tsp, vers)   # (str) detectorctype id
detname- calibration    = cs.detname()type
                # (str) detector name of self object
predecessor = cs.predecessor()           # (str...) detnametsp of- predecessorparameter orto None
successorget time  =stamp cs.successor()evt, runnum, ts_sec) 
          # (str) detname of successor or None
ctypes        = cs.ctypes()                # (listint) vers calibration- typesversion inof the file
cto    calibration, None - use default 
tscfile     = cs.ctypeobjtscfile(ctype)         # (DCType ~ h5py.Group) calibration type object
_________________________________________
nda    int) time stamp of the file creation
dettype     = cs.get(ctype, tsp, vers)dettype()         # (str) ctype - calibration type
 detector type
detid       = cs.detid()           # (str) detector id
detname     = cs.detname()         # (str) detector name of self object
predecessor = cs.predecessor()     # (str) detname of predecessor or None
successor     # (...) tsp - parameter to get time stamp (evt, runnum, ts_sec) 
_________________________________________# (int) vers - version of calibration, None - use default 


DCType methods
==============
ctype= cs.successor()       # (str) detname of successor or None
ctypes      = cs.ctypes()          =# cto.ctype(list) calibration types in the file
cto         = cs.ctypeobj(ctype)   # (strDCType ~ h5py.Group) ofcalibration ctypetype name
tsranges    = cto.ranges()object

# management methods
cs.set_tscfile(ts)                 # set (listint) of time rangesstamp forof ctype
tsrothe file creation      = cto.rangeobj(tsrange)      # (DCRange ~ h5py.Group) time stamp validity range object


DCRange methods
===============
tsbegin     = tsro.begin(
cs.set_dettype(dettype)            # set (str) detector type
cs.set_detid(detid)                # set (str) detector (intid
cs.set_detname(detname) time stamp beginning validity range
tsend       = tsro.end(# set (str) detector name of self object
cs.set_predecessor(pred)           # #set (intstr) timedetname stampof ending validity range
versions    = tsro.versions(predecessor or None
cs.set_successor(succ)             # set (list of uintstr) versionsdetname of calibrations
versodefsuccessor or None
cs.add_ctype(ctype)  = tsro.versdef()             # add (DCVersionstr) ~ h5py.Group) referencecalibration type to the default version in the time-range object
verso DCStore object
cs.del_ctype(ctype)            = tsro.versobj(vers)   # delete ctype (str) from the #DCStore (DCVersion ~ h5py.Group) specified version in the time-range object


DCVersion methods
=================
tsversobject
cs.save(path)                = verso.tsprod()     # save current calibration in the file specified # (int) time stamp of the version production
calibdata   = verso.calib(by path, if path is Null - update current file.

Class DCType

Code Block
cto = DCType(dettype) # (np.arraystr) calibrationdetector arraytype rec# acess methods ctype = versocto.historyctype() # (str) production history record

Management methods

Code Block

DCStore methods
===============
cs.set_tscfile(ts)        of ctype name
tsranges   = cto.ranges()          # (list) of time ranges for ctype
tsro       = cto.rangeobj(tsrange) # (DCRange set (int~ h5py.Group) time stamp ofvalidity the file creation  
cs.set_dettype(dettype)range object

# management methods
cto.add_range(tsr)                 # setadd (str) detector type
cs.set_detid(detidof time ranges for ctype
cto.del_range(tsr)                 # delete range from the DCType object

Class DCRange

Code Block

tsro = DCRange(tsrange# set (str) detector id
cs.set_detname(detname)            # set (str) detectortime namestamp ofvalidity self object
cs.set_predecessor(pred)     range
tsro = DCRange(tsbegin, tsend)      # set (strint,int) detnametime stamp of predecessor or None
cs.set_successor(succ)validity range

# acess methods
tsbegin     = tsro.begin()         # set (strint) detnametime ofstamp successorbeginning orvalidity None
cs.add_ctype(ctyperange
tsend       = tsro.end()           # (int) time stamp ending  # add (str) calibration type to the DCStore object
cs.del_ctype(ctype)    validity range
versions    = tsro.versions()      # (list of float) versions of calibrations
versodef    = tsro.versdef()       # delete ctype (str) from the DCStore object
cs.save(path)         (DCVersion ~ h5py.Group) reference to the default version in the time-range object
verso       = tsro.versobj(vers)   # (DCVersion # save current calibration~ h5py.Group) specified version in the file specified by path, if path is Null - update current file.


DCType methods
==============
cto.add_range(tsr)     time-range object

# management methods
tsro.set_begin(tsbegin)            # addset (strint) oftime timestamp rangesbeginning forvalidity ctyperange
ctotsro.delset_rangeend(tsrtsend)                 # deleteset range(int) fromtime the DCType object


DCRange methods
===============stamp ending validity range
tsro.setadd_beginversion(tsbeginvers)             # set (int)DCVersion time stamp beginning validity range~ h5py.Group) versions of calibrations
tsro.set_endversdef(tsendvers)             # set  # set (int) time stamp ending validity range
tsro.add_version(vers)(DCVersion ~ h5py.Group) versions of calibrations
tsro.del_version(vers)             # delete version

Class DCVersion

Code Block

verso = DCVersion(vers)            # (str) version name

# acess methods
tsvers set (DCVersion ~ h5py.Group) versions of= calibrations
tsro.set_versdef(versverso.tsprod()       # (int) time stamp of the #version setproduction
calibdata (DCVersion ~ h5py.Group) versions of calibrations
tsro.del_version(vers= verso.calib()             # delete version


DCVersion methods
=================# (np.array) calibration array

# management methods
verso.set_tsprod(tsprod)           # set (int) time stamp of the version production
verso.add_calib(nda)               # set (np.array) calibration array
verso.history(rec)                 # (str) set production history record

TBD

Open questions

What is included in the detector Id version? FEE version, controller version, etc?
when constants are updated (file open to write) they are not available... Lock to resolve.

Data flow

who produces and supply constants
who is allowed to submit constants
who is allowed to access constants
ACL inside API or using OS
ACL for all or particular detector/type/ etc.

References

TBD

Open questions

logic for default version
- always last added constants
- set specified version
- what to do with default if new version is added?

when constants are updated (file open to write) they are not available... Lock to resolve.

Data flow

who produces and supply constants
who is allowed to submit constants
who is allowed to access constants
ACL inside API or using OS
ACL for all or particular detector/type/ etc.

2016-10-27 Mtg with cpo

table of aliases with records: <alias> <source> <begin> <end>
repository
<PATH>/detector/calib "g" or "d"
epix100a full name - 6 numbers of hardware versions, firmware version is a 7th number
time double to two integers or int64 (32bit-sec, 32-bit-nsec)
geometry needs to be saved as a text
repository file has geometry and pixel_gain - like constants
do not search in <experiment>/calib
access through network for AMI (cpo: TCP with hardwired IP addresses, m:web service/reddis)

References

...

Page tree

Page History

Versions Compared

Old Version 32

New Version Current

Key

Requirements

Architecture

Calibration directory and files

Default calibration directory in LCLS FS

In local space

Structure of calibration directory

Calibration file structure

Calibration data hierarchical scheme

Calibration directory and files

Repository

Experiment calibration directory

Local calibration directory

Direct path to calibration file

Structure of calibration directory

Calibration file structure

Calibration data hierarchical scheme

Schema features

Metadata in

dictpars

Detector metadata

Calibration parameters' metadata

n-d array metadata

API

Parameters

Initialization

Initialization

UI acess methods

Base class

UI acess methods

Base class DCBase

Access methods

Class DCStore

Class DCType

Management methods

Class DCRange

Class DCVersion

TBD

References

TBD

2016-10-27 Mtg with cpo

References