kie-issues#665: xml-parser-ts Doesn't manage Complex Types with Simple Content

[yesamer]

Closes apache/incubator-kie-issues#665

The problem:

xml-parser-ts it's not able to manage Complex Types with Simple Content, please consider the following example:

XML
<rawValue class="string">Above speed limit: 10km/h and 30 km/h</rawValue>

XSD

<xsd:complexType name="rawValueType">
    <xsd:simpleContent>
      <xsd:extension base="xsd:string">
        <xsd:attribute type="xsd:string" name="class" />
      </xsd:extension>
    </xsd:simpleContent>
  </xsd:complexType>

Generated type:

export type SceSim__rawValueType =   {

}

Fields are missing

At Runtime:

rawValue: 
@_class: "string"

The solution (kudos to @tiagobento )
For any text value, we are going to provide a new __$$text. This will impact any TextContent, in order to unify the text content management. That means, any simple type that previously held text content, now holds an Object with a __$$text field.

Current generated type:

export type SceSim__rawValueType =   {
@_class: string
__$$text: string
}

Fields are missing

At Runtime:

rawValue: 
@_class: "string"
__$$text: "value"