message: modified MOBILE_API.xml to support the changes needed for metadata
  tagging
diff: </enum>
  + <enum name="TextFieldType">
  + <element name="mediaTitle">
  + <description>The data in this field contains the title of the currently playing audio track.</description>
  + </element>
  + <element name="mediaArtist">
  + <description>The data in this field contains the artist or creator of the currently playing audio track.</description>
  + </element>
  + <element name="mediaAlbum">
  + <description>The data in this field contains the album title of the currently playing audio track.</description>
  + </element>
  + <element name="mediaYear">
  + <description>The data in this field contains the creation year of the currently playing audio track.</description>
  + </element>
  + <element name="mediaGenre">
  + <description>The data in this field contains the genre of the currently playing audio track.</description>
  + </element>
  + <element name="mediaStation">
  + <description>The data in this field contains the name of the current source for the media.</description>
  + </element>
  + <element name="rating">
  + <description>The data in this field is a rating.</description>
  + </element>
  + <element name="currentTemperature">
  + <description>The data in this field is the current temperature.</description>
  + </element>
  + <element name="maximumTemperature">
  + <description>The data in this field is the maximum temperature for the day.</description>
  + </element>
  + <element name="minimumTemperature">
  + <description>The data in this field is the minimum temperature for the day.</description>
  + </element>
  + <element name="weatherTerm">
  + <description>The data in this field describes the current weather (ex. cloudy, clear, etc.).</description>
  + </element>
  + <element name="humidity">
  + <description>The data in this field describes the current humidity value.</description>
  + </element>
  + </enum>
  +
  <enum name="ImageFieldName">
  <element name="softButtonImage">
  <description>The image field for SoftButton</description>
  </param>
  </struct>
  + <struct name="MetadataStruct">
  + <param name="mainField1" type="TextFieldType" minsize="0" maxsize="5" array="true" mandatory="false">
  + <description>The type of data contained in the "mainField1" text field.</description>
  + </param>
  + <param name="mainField2" type="TextFieldType" minsize="0" maxsize="5" array="true" mandatory="false">
  + <description>The type of data contained in the "mainField2" text field.</description>
  + </param>
  + <param name="mainField3" type="TextFieldType" minsize="0" maxsize="5" array="true" mandatory="false">
  + <description>The type of data contained in the "mainField3" text field.</description>
  + </param>
  + <param name="mainField4" type="TextFieldType" minsize="0" maxsize="5" array="true" mandatory="false">
  + <description>The type of data contained in the "mainField4" text field.</description>
  + </param>
  + </struct>
  +
  <struct name="Choice">
  <description>A choice is an option given to the user, which can be selected either by menu, or through voice recognition system.</description>
  <param name="choiceID" type="Integer" minvalue="0" maxvalue="65535" mandatory="true"/>
  </description>
  </param>
  + <param name="textFieldMetadata" type="MetadataStruct" mandatory="false">
  + <description>
  + App defined metadata information. See MetadataStruct. Uses mainField1, mainField2, mainField3, mainField4.
  + If omitted on supported displays, the currently set metadata tags will not change.
  + If any text field contains no tags, the metadata tag for that textfield should be removed.
  + </description>
  + </param>
  +
  </function>
  <function name="Show" functionID="ShowID" messagetype="response">
  