Reads an ISML template from the file system and renders it into a
MimeEncodedText object. Optional substitution values can be
passed to the isml template via the
render(Map)
method. Substitution parameters can be accessed within the template through
<isprint value="${param.parameter}">
or for backward compatibility through
<isprint value="${pdict.parameter}">
The access through pdict only gives access to the parameter map provided at
rendering time and doesn't offer access to the system PipelineDictionary. The
pdict access to the property map is only considered to ease the transition
from SendMail pipelet API based templates. If the PipelineDictionary or
properties of the PipelineDictionary are needed, they need to be included in
the Property map passed to the render method.