Constant XML_PARSE_NO_TREE 

pub const XML_PARSE_NO_TREE: i32 = _; // 1_073_741_824i32

Deliver SAX events without building a document tree. A rusty_xml extension, not a libxml2 flag.

Every entry point here materialises the whole document, including the ones whose job is streaming: xml_sax_parse_memory built a full tree and then discarded it, and xml_reader_for_memory builds a tree and walks it with a cursor. A consumer that only wants text – an indexer, a document converter – paid for a DOM it never touched.

With this set, character data, CDATA, comments, processing instructions and attributes create no nodes. The SAX event stream is unchanged and complete; the returned XmlDoc holds only the element skeleton and should be ignored.