  CMS ECAL physicists must be able to extract physics characteristics from the
ECAL construction database for the calibration of sets of detector components.
Other applications, such as geometry for simulation and physics event
reconstruction, will also need to extract data from the construction database.
In each case, application software needs to query the construction database and
to extract data that satisfies a particular view. These viewpoints are defined
for a specific purpose (e.g. simulation, slow control, calibration) and data
must be extracted into the viewpoint for a set of defined detector components
(e.g. readout channels) called physics elements.
  The ECAL construction database follows an object-oriented design to maximise
flexibility and reusability. An meta-modelling approach has been taken in its
design, which promotes self-description and a degree of data independence. A
query facility is being provided to allow navigation around so-called
meta-objects in the construction database, facilitating the extraction of
physics data into a particular viewpoint. This paper outlines how viewpoints
can be populated with data extracted from the construction database, for a set
of detector elements relevant for analysis.
