Function build_graph 

pub fn build_graph(
    dict: &PageDict,
    r: &impl Resolve,
    limits: &Limits,
    ctx: &mut BuildContext,
    diags: &mut Diagnostics,
) -> Page

The object graph of dict’s page for editing, read through r: the base document for a page as it was opened, or an editing session’s overlay for the page as that session’s edits leave it — so a stream an earlier edit appended is a clean stream of the graph, and the names it uses are kept.