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OPFSpine Struct
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| import Kanna | |
| struct OPFSpine { | |
| private(set) var idrefs = [String]() | |
| init?(package: XMLElement) { | |
| guard let spine = package.at_xpath("opf:spine", namespaces: XPath.opf.namespace) else { return nil } | |
| idrefs = spine.xpath("opf:itemref[@idref]/@idref", namespaces: opfNamespace) | |
| .map { $0.text } | |
| .compactMap { $0 } | |
| } | |
| } |
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