The root-element

The root-element serves as the root-element of a Fib object. It should provide all (enviroment) informations that are needed to evaluate the Fib object. The root-element itself can just be contained in other root-elements, but not in other Fib elements.

Syntax:

$$\begin{eqnarray*} Rootobj &=& root( [Multimediainformation], [Domains], \\ && [... ... DB\_Identifier_1, \ldots , DB\_Identifier_d)], [Optionalpart] ) \end{eqnarray*}$$

All elements, except the actual multimedia object (main-Fib-object) $Obj$, are optional and can therefore be omitted.

Description of the elements:

• $Obj$: The actual multimedia object (main-Fib-object), which is to be displayed. This in turn can represent more multimedia objects (e. g. images).
• $(Identifier_i, Rootobj_i)$: $Identifier_i$ is an identifier (a unique natural number), which can be used in an external part object (see $obj$ element, in section 9.9 on page ). $Rootobj_i$ is the associated external subobject (which itselves begins with a root-element). If in the $Obj$ (main-Fib-object) an external object is not resolved, the $Identifier_i$ will be searched for the correct/same identifier as that of the external object and, if one is found, the associated $Rootobj_i$ will be used for (/resolved as) the external object. The Fib object, which is the external object, is always the basis for the search. In the search, first the next root-element, in which the basis Fib object is contain, will be searched, and then successively the root-element, which contains the last searched root-element. If in all the searched root-elements till the Fib object root (in which all the external / Fib object exists) no matching identifier is found, the database will be searched. If there also no matching identifier can be found, the empty point $p()$ will be used for the external object.
• $MultimediaInformation$: The $MultimediaInformation$ contains the necessary information for the evaluation of the multimedia data (see section 9.14.1 on page ), this information are for example the Fib version and database version.
• $Domains$: This element contains the domains for the values and variables in the different vectors (e. g. position and property vectors) and Fib elements (see section 9.14.2 on page ). Thus the number of assignment possibilities for each item is restricted, in order to determine in advance, if the available hardware for displaying can view the multimedia object.
• $DomainsValues$: Contains the domains of the values in the different vectors (e. g. position and property vectors) and Fib elements (see section 9.14.2 on page ). This limits the number of possible values and therefore the number of bits to store them, it makes it possible to achieve a better compression.
• $InVar_i$: The $InVar_i$ are the input variables for the actual multimedia object (main-Fib-object) $Obj$. These are defined by the root-element for the main-Fib object $Obj$ and are set by external sources (such as the external object in a Fib object). Even the top most root-element can contain input variables, these represent degrees of freedom for the multimedia data, which have to be set by external programs, e. g. to combine in a Fib object an archive of images, whose partial images can be selected with an input variable $InVar_i$, or to choose different languages. The domain of each input variable should be specified in the $Domains$ part. The default domain for input variable is $integerB(16)$. If in the evaluation for an input variable $InVar_i$ no value is provided, it is set to its default value $S_i$.
• $S_i$: $S_i$ is the default value of the input variable $InVar_i$. If in the evaluation for an $InVar_i$ no value is specified, the $InVar_i$ is set to the value $S_i$. The value $S_i$ should be part of the domain for $InVar_i$.
• $DB\_Identifier_i$: These list can specify the identifiers of the database objects, which are used in the main-Fib-object $Obj$
• $Optionalpart$: In this fild optional information is stored, which is not required for evaluation of the multimedia data (see section 9.14.3 on page ). These can include the Copyrigth, author or description texts.