public String entityTag()
    {
        return (null != tags && tags.length > ENTITY_TAG_INDEX) ? tags[ENTITY_TAG_INDEX] : null;
    }
public String entityTag()
    {
        return (null != tags && tags.length > ENTITY_TAG_INDEX) ? tags[ENTITY_TAG_INDEX] : null;
    }
public String entityTag ( ) { return ( null != tags && tags . length > ENTITY_TAG_INDEX ) ? tags [ ENTITY_TAG_INDEX ] : null ; }
Get the entity tag, if it exists, that refers to an entity such as subscription or publication.

@return entity tag if it exists or null if not in this URI.
@see CommonContext#TAGS_PARAM_NAME
@see CommonContext#TAG_PREFIX
Get the entity tag if it exists that refers to an entity such as subscription or publication .