Swagger-PHP isn't outputting "xml" when specified as child of "items"

[xiehan]

The 2.0 spec makes it pretty clear that you should be able to specify xml as a child property of items in a definition, e.g.:

animals:
  type: array
  items:
    type: string
    xml:
      name: animal
  xml:
    wrapped: true

However, I have a definition (some other unnecessary properties truncated) coded in Swagger-PHP as follows:

/**
 * @SWG\Definition(definition="InLineXml",
 *   type="object",
 *   @SWG\Property(property="Extensions",
 *     type="array",
 *     @SWG\Items(type="string",
 *       @SWG\Xml(name="Extension")
 *     ),
 *     @SWG\Xml(wrapped=true)
 *   )
 * )
 */

which outputs:

        "InLineXml": {
            "properties": {
                "Extensions": {
                    "type": "array",
                    "items": {
                        "type": "string"
                    },
                    "xml": {
                        "wrapped": true
                    }
                }
            },
            "type": "object"
        }

And another definition:

/**
 * @SWG\Definition(definition="ErrorXmlDocument",
 *   type="object",
 *   @SWG\Xml(name="DAAST"),
 *   @SWG\Property(property="error",
 *     type="array",
 *     @SWG\Items(type="string",
 *       @SWG\Xml(name="error")
 *     ),
 *     @SWG\Xml(wrapped=false)
 *   )
 * )
 */

which outputs:

        "ErrorXmlDocument": {
            "properties": {
                "error": {
                    "type": "array",
                    "items": {
                        "type": "string"
                    },
                    "xml": {
                        "wrapped": false
                    }
                }
            },
            "type": "object",
            "xml": {
                "name": "DAAST"
            }
        }

In neither case, the xml property of the items definition is present. However, I don't get any compiler errors.