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Assigning to a named child counts its list of the matching children, and assigning through an empty XMLList counts the chain of targets it climbs, before either changes the tree. copy(), toXMLString(), normalize(), the `..` selector and the depth check on insertion hold the stack they keep for each open level of the tree. Inserting an XMLList, and assigning one to an item of an XMLList, hold their copy of the list's items. copy() reads attributes in place, and toXMLString() reads attributes and namespace declarations in place, instead of copying the lists. copy() charges the declarations it copies before it copies them. Deleting by name or assigning an attribute compacts the remaining links in place instead of building a second list. toXMLString() holds the set of prefixes a namespace lookup passes, and picks a new nsN prefix in one pass over the declarations in scope instead of rescanning them for each candidate. The parser holds its open elements and their names, the text it gathers, each tag's attribute values, the sets that check declarations and attribute names, and its one copy of an element's namespaces, and it charges the strings of the namespace declarations it makes. The allowance it holds from the source's length covers the copy a value takes as it becomes a string. Comparing XML values, converting them to strings, assigning an XMLList to an attribute, and reading a name, a qualifier, a namespace URI or embedded text from a string built by joining strings flatten it with flat_charged. An attribute name read from a string reserves its copy, and an element name shares the string. Docs: docs/target-app-parity.md.