# EduTVA: Metadata Schema for Educational Audiovisual Contents in Digital Television Environments
## 3 Overview of the EduTVA Metadata Schema
### New Metadata Schema: Adapting the Base Schema  
To adequately carry out an adaptation process of TV-Anytime, the base metadata schema selected, it was necessary to follow three steps. First, to choose the set of elements of TV-Anytime suitable for the description of educational audiovisual content. Second, to adapt the educational metadata selected in the previous section to the elements of TV-Anytime. Lastly, to identify the elements of TV-Anytime that describe segments of the content and adapt the educational metadata to them. As the new schema, EduTVA is the result of the adaptation of the set of educational metadata selected from TV-Anytime. So, it uses the same namespaces established in its in-force XML Schema Definition (XSD) document (i.e., XML document for metadata representation) and inherits all the types of basic data of that standard. Furthermore, it acquires all the attributes of the selected elements and the sets of values for some metadata. The selected metadata are shown in Figure 1. The process starts at the green point and proceeds counterclockwise. The cardinality of each item selected for EduTVA is specified. The type of data that has had any change is also indicated. If the data type of an element is not detailed, it inherits all the properties defined by TV-Anytime. The attributes of EduTVA elements fully inherit the TV-Anytime standard, and their descriptions can be found in [16; 35]. TV-Anytime allows us to define various contexts for the same content. For example, some content used in a travel magazine with an emphasis on entertainment, together with a collection of content with information about a trip, can also be used in an educational geography program. The previous is possible thanks to the element ContextAttributesType, which is a type of abstract data that serves as a base to define the attributes of five contexts: data broadcasting context, interstitial context, the context of an application that contains a set of functions that will be executed in the consumer domain, game context, and educational context. This work is focused on the description of the educational context of the resource, because of this, it adapts to the element EducationalContextAttributesType of TVAnytime using the educational metadata defined in section 3.2. The elements that originally composed EducationalContextAttributesType do not cover the whole educational context, which can be defined through the metadata used by the educational schemas. Nevertheless, TV-Anytime has a simple syntax that can be modified easily and adapted according to the set of educational metadata selected for EduTVA. Three new data types have been created, and the existing elements have been redefined, considering the classification of the new educational metadata defined in section 3.2. Thus, in the blue point, five new features have been obtained that make up ContextEducativeType, as can be seen in Figure 1.  
Metadata created for EduTVA are EducationalResource of the type EducationalResourceType to describe the type of educational resource. EducationalContext of the type ControlledTermType to describe the context of the application of the resource. EducationalAudience of the type EducationalAudienceType to describe the target educational audience. Annotation of the type TextualType to carry out annotations related to the educational resource. Finally, EducationalResults of the type EducationalResultsType to describe the educational results obtained by interacting with the audiovisual resource. Each element added by EduTVA represents one of the metadata groups defined in section 3.2, and its elements represent the defined metadata in the corresponding group. The new types of data added by EduTVA are EducationalResourceType, EducationalAudienceType, and EducationalResultsType. It is important to remember that TV-Anytime implements the concept of classification schemes to define a set of values for certain types of metadata. EduTVA inherits this property.