href means that: we are referencing 'name' element. This entire thing will be transformed (internally, invisible to ruby developers) into:
```yaml
name:
   doc: The name of the DRD.
   href: http://alps.io/schema.org/Text
   ext: _name
```
btw, href can be 'name', 'DRDs#name' or 'http://otherthing.com/items#name'. 
'name' means 'name' in this current document.
'DRDs#name' means name from the document with document ID: DRDs.
'http://otherthing.com/items#name' - obvious.