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        Storefront RSS Specification Version 0.5
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        The Storefront RSS specification is an extension of the RSS 2.0 specification. 
        
        Namespace:
            The namespace is defined as 'http://www.synctv.com/standards/sfrss.html'
            
            e.g. <rss version="2.0" xmlns:synctv="http://www.synctv.com/standards/sfrss.html">

        The following additional elements must be supported for Storefront RSS.


        Additional subelements of <channel>:
            <synctv:serviceInfo>
                describes service info, contains name and version attributes     

            <synctv:channelId>
                the ID of the server channel from the database

            <synctv:channelName>
                the name of the server channel from the database
                
            <synctv:channelSubscribe>
                URL to subscribe to this channel, must include "price" attribute   
                (ex.: "USD 12.99", decimal separated amount; absence of 3 char currency 
                label assumes local currency)
                
            <synctv:showId>
                the ID of the show on the server
                
            <synctv:showName>
                the name of the show where the content is located on the server
                
            <synctv:showSubscribe>
                URL to subscribe to this show, must include "price" attribute   
                (ex.: "USD 7.99", decimal separated amount; absence of 3 char currency 
                label assumes local currency)
                
            <synctv:volumeId>
                volume or season ID
                
            <synctv:volumeNumber>
                volume or season number, ex.: "3"
                
            <synctv:volumeEpisodes>
                a count of the episodes in this volume, ex.: "3"
                
            <synctv:latestVolumeId>
                the id of the most recent volume of the show, ex.: "3"
                
            <synctv:purchase> 
                URL to purchase entire set of items, must include "price" attribute   
                (ex.: "USD 12.99", decimal separated amount; absence of 3 char currency 
                label assumes local currency)
                
            <synctv:rent>
                URL to rent entire set of items, must include "price" attribute   
                (ex.: "USD 4.99", decimal separated amount; absence of 3 char currency 
                label assumes local currency)
                
            <synctv:banner>
                URL to a banner or background image for set of items
                
            <synctv:complete/>
                if tag exists then the set of items is complete; additional items will 
                not be added to the feed
                
            <synctv:seasonal/>
                if tag exists then the set of items is a season


        Additional subelements of <item>:
            <synctv:language>
                the language spoken in the media (e.g. en-us)

            <copyright>
                the copyright of the media

            <synctv:categoryId>
                colon separated category and subcategory ids (ex.: "13:21")

            <synctv:episodeId>
                episode ID from the database

            <synctv:episodeNumber>
                ex.: "46"; episode numbers typically span across all seasons or volumes)

            <synctv:parentalAdvisory>
                use the format defined by CEA-2033 "OpenEPG"

            <contentRating>
                use the format defined by CEA-2033 "OpenEPG"

            <synctv:purchase>
                URL to purchase episode must include "price" attribute   (ex.: "USD 1.99", 
                decimal separated amount; absence of 3 char currency label assumes local 
                currency)

            <synctv:rent>
                URL to rent item, must include "price" attribute (ex.: "USD 0.49", decimal 
                separated amount; absence of 3 char currency label assumes local currency)

            <synctv:preview>
                URL to preview item

            <synctv:duration>
                hh:mm:ss

            <synctv:quality>
                allowed values are based upon optional domain attribute; absence of domain 
                attribute assumes "basic" domain ("basic" domain allows quality values "Low", 
                "Standard", "HD", or "Full HD")

            <synctv:unlicensed/>
                If present this tag indicates that the content is not licensed to the logged 
                in account and the enclosure should not be made available for download.