description of attribute style:class is incorrect

In ODF 1.0 and 1.1, the attribute style:class is described like this:
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A style may belong to an arbitrary class of styles. The class is an arbitrary string. The class has no meaning within the file format itself, but it can for instance be evaluated by user interfaces to show a list of styles where the styles are grouped by its name.
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In ODF 1.2, the definition changed to this:
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The style:class attribute specifies a style class name. A style class name is a string and any style may belong to any number of classes. A style may belong to any class of styles.
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The problem is this part: 'any style may belong to any number of classes'. Each style has only one style:class attribute and that attribute contains only one name. So it is only possible to be part of multiple classes via inheritance.