Re: [xml-dev] XML Programming Language, specification to write

[jf.larvoire@free.fr]

Hello Victor,

A slightly off-subject remark:
I think all XML-based programming languages (like XSLT) are seriously handicapped by the verbosity of XML.
This seriously limits their acceptance by non-XML-specialists.

If usability is one of yours goals, you can make your language look like more traditional programming languages,
by passing any such piece of XML code through my reversible XML<->SML converter.

For example, the sample on your wiki automatically becomes:

prog:macro name="f" {
  prog:arguments {
    prog:argument name="x"
    prog:argument name="y"
  }
  prog:body {
    prog:value name="x"; "then" ;prog:value name="y"
  }
}

And then this can be converted back to the initial XML sample code.

You can even experiment with the syntax when viewed as SML, and then convert it back to XML to see what this yields.
For example if I remove the quotes around the "then" above, to make it look like the C-language then keyword instead of a C string, the SML code converts back to:

<prog:macro name="f">
  <prog:arguments>
    <prog:argument name="x"/>
    <prog:argument name="y"/>
  </prog:arguments>
  <prog:body>
    <prog:value name="x"/> <then/><prog:value name="y"/>
  </prog:body>
</prog:macro>

(Which screams for a prog:then namespace prefix.)

The source for the sml2 converter, and the sml2.exe version compiled for Windows, is available there:
https://github.com/JFLarvoire/libxml2/releases

Note that to avoid libxml2 errors about undefined namespaces, you need to use sml2 option -pE.
(I'll need to change the sml2 program to ignore such errors by default, because the goal of that conversion program is to convert any piece of XML, and not just complete valid files.)

Jean-François

----- Mail original -----
De: "Victor Porton" <porton@narod.ru>
À: xml-dev@lists.xml.org
Envoyé: Lundi 15 Octobre 2018 23:44:58
Objet: [xml-dev] XML Programming Language, specification to write

At https://en.wikiversity.org/wiki/XML_Programming_Language

I started to write specification of a Turing-complete macro language for 
XML.

First, it will allow to define macroses without arguments (with use 
similar to XML entities), macroses with arguments, and macroses with 
full-featured programming capabilities.

Please help me to develop the specification and to implement it.


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