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As the first step in a comprehensive, comparative, direct analysis of thespectra of Type Ia supernovae (SNe Ia), we use the parameterized supernovasynthetic-spectrum code, SYNOW, to interpret 26 spectra of the well-observed SN1994D. Our results are consistent with the traditional view that thecomposition structure (element abundance fractions versus ejection velocity) isradially stratified. We find that resonance-scattering features due topermitted lines of Ca II, Na I, and Fe II persist to more than 100 days afterexplosion. The fitting parameters for SN 1994D, together with those to bedetermined for other SNe Ia, will provide an internally consistentquantification of the spectroscopic diversity among SNe Ia, and shed light onhow the various manifestations of observational diversity are related to theirphysical causes.Comment: 22 pages including 11 figures and 1 table. To appear in PAS

Comparative Direct Analysis of Type Ia Supernova Spectra. I. SN 1994D