Silence biber warning "Invalid field 'XXX' for entrytype 'YYY'"

Question

I have created a few aliases of bibliography types, e.g. standard is a report or software is online. Now, when using such types in my bib file and enabled --validate-datamodel, I get warnings like:

Datamodel: Entry 'Spread' (thesis.bib): Invalid field 'url' for entrytype 'software'

How can I make biber happy about this again? Any way to enhance the data model for the aliases?

MWE

\documentclass{article}

\usepackage{filecontents}

\begin{filecontents}{test.bib}
@standard{RFC4627,
 date = {2006},
 editor = {IETF},
 number = {4627},
 title = {The application/json Media Type for {JavaScript} Object Notation ({JSON})},
 type = {RFC},
 url = {http://www.ietf.org/rfc/rfc4627.txt},
 urldate = {2016-09-08}
}

@software{Spread,
 label = {Spread},
 title = {The Spread Toolkit},
 url = {http://www.spread.org/},
 urldate = {2016-09-08}
}
\end{filecontents}

\usepackage[backend=biber,style=alphabetic]{biblatex}

\DeclareBibliographyAlias{software}{online}
\DeclareBibliographyAlias{standard}{report}
\bibliography{test}

\begin{document}
    \nocite{*}
    \printbibliography{}
    % should still work
    \printbibliography[heading=bibintoc,type=software,title={Lis‌​t of Software Packages}]{}
\end{document}

Compiled using latexmk with the following latexmkrc:

$pdf_mode = 1;
$pdflatex = 'pdflatex -shell-escape -interaction=nonstopmode';

$biber = 'biber --validate-datamodel %O %S';

Answer 1

As explained in What exactly is the relationship BibLaTeX refers to as an alias of an entry type? And how should the formatting of aliased entry types be configured? the alias defined by \DeclareBibliographyAlias is only for bibliography driver purposes. The alias is only accessible for biblatex. In particular Biber does not know about it.

You could do

\DeclareDriverSourcemap[datatype=bibtex]{
  \map{
    \pertype{software}
    \step[typesource=software, typetarget=online, final]
    \step[fieldset=keywords, fieldvalue={,type:software}, append]
  }
  \map{
    \pertype{standard}
    \step[typesource=standard, typetarget=report, final]
    \step[fieldset=keywords, fieldvalue={,type:standard}, append]
  }
}

This will remap @software to @online and @standard to @report for all intents and purposes (so you can't select by type any more). To remedy this, we add keywords that give the former type with the keyword type:<type>.

Now your filtering is not type=<type>, but keyword = {type:<type>}, i.e.

\printbibliography[heading=bibintoc, keyword=type:software],

instead of \printbibliography[heading=bibintoc, type=software].