The usage of text parameter of "Add Item" api

[taichikukizaki]

Observing a request from my client PC to the ArcGIS online,
in the event of creating a web map item, the text parameter of
"add item REST API" includes the lines below:

{"operationalLayers":[{"url":"http://ows.geogrid.org/basemap","id":"wms_8527","visibility":true,"visibleLayers":["lands","islands","lakes","ponds"],"opacity":1,"title":"GEO Grid, AIST. WMS ...

On the ArcGIS REST API Resources
http://resources.arcgis.com/en/help/arcgis-rest-api/index.html#//02r30000008q000000
"text" parameters describes
  The text content for the item to be submitted.
  Example: text=Any+plain+text+content

Does anyone instill me the usage of the text parameter, not just a text?

[RichardWatson]

What is says is that this is "The text content for the item to be submitted".

I believe that this is saying that the text content is based on the type of item/object.

Here is the link to the various objects:

http://resources.arcgis.com/en/help/arcgis-web-map-json/index.html#//02qt00000006000000