A system and related techniques accept extensible application markup language (XAML) inputs corresponding to object trees, such as those representing user interface elements, and map those inputs to a binary construct. A mapping engine may generate tokenized binary outputs representing the XAML file input and ultimately the associated user interface or other object. The binary representation generated by the mapping engine may be optimized in multiple ways, including to encode dimension information such as length, width etc. of dialog boxes or other elements in the binary representation without a necessity for explicit definition. Other optimizations include the type indexing of data types when a novel instance of the type is first encountered, and embedding loader definitions to load the object or data reflected in the binary representation without having to do a lookup against loader lists.