Returns `true` if this table has a header A table has a header when it contains at least two row groups. ```rust use orgize::{Org, ast::OrgTable}; let org = Org::parse(r#" | a | b | |---+---| | c | d |"#); let table = org.first_node:: ().unwrap(); assert!(table.has_header()); let org = Org::parse(r#" | a | b | | 0 | 1 | |---+---| | a | w |"#); let table = org.first_node:: ().
(&self)
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