Function preserveAttributeAs

Preserves the given data attribute as the given view attribute. Thus, it provides a mapper for toView renaming attribute given by dataAttributeName to attribute named viewAttributeName.

If a data attribute has alias names, you may specify them in dataAttributeAliases. Note, that the first existing attributes value in [dataAttributeName, ...dataAttributeAliases] will be taken into account. All other attributes will be lost in this processing.

Example: **Simple Use Case:** Mapper to store data attribute `xlink:type` in view as `data-xlink-type`:

mapper = preserveAttributeAs("xlink:type", "data-xlink-type");
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Example: **Extended Use Case:** Mapper to store data attribute `lang` with alias `xml:lang` in view as `lang`:

mapper = preserveAttributeAs("lang", "lang", "xml:lang");
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