I am developing a domain-specific programming language called JS2DX written in Javascript. It is aimed at providing a simplified, shortened syntax for creating UI pages using DHTMLX components while fully compatible with native DHTMLX code. Multipart UI pages are coded within one JSON (or XML) struct using key-value pairs.
For example this is code of a three frame layout UI page with tree, grid and form:
  layout: {
     id     : 'A'
    ,pattern: '3L'
    ,cells  : [{
        caption: 'Locations'
       ,width  : '220'
       ,attach : {
          tree : {
            id    : 'navigate'
           ,source: {url:'./xml/regions.xml'}
           ,event : {
               type  : 'onClick'
              ,action: function(id){
                if (navigate.getLevel(id) == 1) return; 
                list.clearAll();
                list.loadXML('xml/list_'+id+'.xml');
              }
           }
         }
       }
    },{
        caption: 'List'
       ,attach : {
          grid: {
             id     : 'list'
            ,columns: [ 
                {name: 'Name',   sort: 'str', filter: "#text_search"}
               ,{name: 'Mobile', sort: 'str', filter: "#text_search"}
               ,{name: 'DOB',    sort: 'str', filter: "#text_search"}
               ,{name: 'DL',     sort: 'str', filter: "#text_search"}
            ]
            ,event: {
              type: 'onRowSelect'
             ,action: function(id) {
                 detail.clear();
                 detail.load('xml/detail_'+navigate.getSelectedItemId()+'_'+id+'.xml');
               }
            } 
          }
       }
    },{
        caption: 'Details'
       ,attach : {
          form: {
             id    : 'detail'
            ,fields: [
                {type:'settings', labelWidth:110, inputWidth:150}
               ,{type:'input',    name: 'name', label: 'Driver\'s Name:'}
               ,{type:'calendar', name: 'dob',  label: 'DOB:', enableTime: false}
               ,{type:'input',    name: 'mob',  label: 'Mobile:'}
               ,{type:'input',    name: 'dl',   label: 'License #:'}
               ,{type:'button',   name:'sav', width:150,offsetLeft:50,
                       value:'Save', position:'label-center'}
               ,{type:'newcolumn'}
               ,{type:'input',    name: 'make', label: 'Vehicle Make:'}
               ,{type:'input',    name: 'mile', label: 'Mileage:'}
               ,{type:'input',    name: 'note', label: 'Note:', rows:2}
               ,{type:'button',   name:'can', width:150,offsetLeft:50, offsetTop:10,
                       value:'Cancel', position:'label-center'}
             ]
          }
       }
    }]
  }