An illustrative embodiment includes processing parse tree data. A parse tree data structure that is representative of a document object model (DOM) tree data structure is received. The parse tree data structure is projected onto a data structure that includes a binary tree. The projecting includes storing a projection that includes an association between each DOM node and a respective associated binary tree node, thereby creating a map between the parse tree data structure and the binary tree data structure. Requests to manipulate the parse tree and binary tree data structures that include node inserts and document order comparisons are also performed.