Added allowEmptyValue

Author: webron

versions/2.0.md

@@ -569,6 +569,7 @@ Field Name | Type | Description
 <a name="parameterFormat"></a>format | `string` | The extending format for the previously mentioned [`type`](#parameterType). See [Data Type Formats](#dataTypeFormat) for further details.
 <a name="parameterItems"></a>items | [Items Object](#itemsObject) | **Required if [`type`](#parameterType) is "array".** Describes the type of items in the array.
 <a name="parameterCollectionFormat"></a>collectionFormat | `string` | Determines the format of the array if type array is used. Possible values are: <ul><li>`csv` - comma separated values `foo,bar`. <li>`ssv` - space separated values `foo bar`. <li>`tsv` - tab separated values `foo\tbar`. <li>`pipes` - pipe separated values <code>foo&#124;bar</code>. <li>`multi` - corresponds to multiple parameter instances instead of multiple values for a single instance `foo=bar&foo=baz`. This is valid only for parameters [`in`](#parameterIn) "query" or "formData". </ul> Default value is `csv`.
+<a name="parameterAllowEmptyValue">allowEmptyValue | `boolean` | Sets the ability to pass empty-valued parameters. This is valid only for either `query` or `formData` parameters and allows you to send a parameter with a name only.
 <a name="parameterDefault"></a>default | * | Sets a default value to the parameter. The type of the value depends on the defined [`type`](#parameterType). See http://json-schema.org/latest/json-schema-validation.html#anchor101.
 <a name="parameterMaximum"></a>maximum | `number` | See http://json-schema.org/latest/json-schema-validation.html#anchor17.
 <a name="parameterExclusiveMaximum"></a>exclusiveMaximum | `boolean` | See http://json-schema.org/latest/json-schema-validation.html#anchor17.