The type Descriptor is too specific

[TobbeEdgeware]

There are many elements in the MPD which have DescriptorType such as Role, Reporting, Scope etc.

A DescriptorType element have three members

@schemeIdUri mandatory
@value optional
@id optional

but is somewhat more complex according to the xsd (ISO/IEC 23009-1 Section 5.8.3).

<!-- Descriptor -->
<xs:complexType name="DescriptorType">
  <xs:sequence>
    <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
  </xs:sequence>
<xs:attribute name="schemeIdUri" type="xs:anyURI" use="required"/> <xs:attribute name="value" type="xs:string"/>
<xs:attribute name="id" type="xs:string"/>
<xs:anyAttribute namespace="##other" processContents="lax"/>
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Downloaded: 2019-09-18
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</xs:complexType>

However, the code currently defines Descriptor to be a DRM-specific descriptor with Cenc and ppsh entries.
It would be good to rename that to DrmDescriptor or something similar and have a generic Descriptor type that
can be used for other values in the DRM.