createElement.js

function createElement(definition) {
  var attributes = definition.attributes

  if (typeof definition.elementName !== 'string') {
    var Class = definition.elementName

    if (Class.getMetadata) {
      var oMetadata = Class.getMetadata()
      var sDefaultAggregation = oMetadata._sDefaultAggregation
      if (typeof sDefaultAggregation === 'string') {
        if (attributes[sDefaultAggregation] !== undefined && definition.children.length === 1) {
          attributes[sDefaultAggregation].template = definition.children[0]
        } else {
          attributes[sDefaultAggregation] = definition.children
        }
      }
    } // else create a sap.ui.core.HTML?

    return new Class(attributes);
}