  We describe the implementation of Quantum Electrodynamic (QED) evolution at
Leading Order (LO) along with Quantum Chromodynamic (QCD) evolution at
Next-to-Leading Order (NLO) in the CTEQ-TEA Global analysis package. The
inelastic contribution to the photon Parton Distribution Function (PDF) is
described by a two-parameter ansatz, coming from radiation off the valence
quarks, and based on the CT14 NLO PDFs. Setting the two parameters to be equal
allows us to completely specify the inelastic photon PDF in terms of the
inelastic momentum fraction carried by the photon, $p_0^\gamma$, at the initial
scale $Q_0=1.295$ GeV. We obtain constraints on the photon PDF by comparing
with ZEUS data~\cite{Chekanov:2009dq} on the production of isolated photons in
deep inelastic scattering, $ep\rightarrow e\gamma+X$. For this comparison we
present a new perturbative calculation of the process that consistently
combines the photon-initiated contribution with the quark-initiated
contribution. Comparison with the data allows us to put a constraint at the
90\% confidence level of $p_0^\gamma\lesssim0.14\%$ for the inelastic photon
PDF at the initial scale of $Q_0=1.295$ GeV in the one-parameter radiative
ansatz. The resulting inelastic CT14QED PDFs will be made available to the
public. In addition, we also provide CT14QEDinc PDFs, in which the {\em
inclusive} photon PDF at the scale $Q_0$ is defined by the sum of the inelastic
photon PDF and the elastic photon distribution obtained from the Equivalent
Photon Approximation.
