Add shared designmap root and include builders

crates/idml/src/lib.rs

@@ -39,7 +39,10 @@ pub mod value;
 
 pub use craft_xml::{El, Local, Node};
 pub use package::{Document, Limits, Package, write_package};
-pub use part::{CONTAINER_XML, Props, designmap_xml, designmap_xml_with_pi, parse_part, part_root, part_xml, prop, with_props, xml_limits};
+pub use part::{
+    CONTAINER_XML, Props, designmap_include, designmap_root, designmap_xml, designmap_xml_with_pi, parse_part, part_root, part_xml, prop, with_props,
+    xml_limits,
+};
 
 /// The IDML package mimetype (content of the first, stored `mimetype` entry).
 pub const MIMETYPE: &str = "application/vnd.adobe.indesign-idml-package";

crates/idml/src/part.rs

@@ -16,6 +16,25 @@ pub const fn xml_limits() -> craft_xml::Limits {
 /// `META-INF/container.xml` of a package.
 pub const CONTAINER_XML: &str = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>\n<container version=\"1.0\" xmlns=\"urn:oasis:names:tc:opendocument:xmlns:container\">\n\t<rootfiles>\n\t\t<rootfile full-path=\"designmap.xml\" media-type=\"text/xml\"/>\n\t</rootfiles>\n</container>\n";
 
+/// The standard root element for `designmap.xml`, including its required namespace and core
+/// document identity fields. The caller supplies DesignCraft-independent values; children are
+/// appended after construction.
+pub fn designmap_root(self_id: &str, story_list: &str, name: &str, zero_point: &str, active_layer: &str) -> El {
+    El::new("Document")
+        .with_attr("xmlns:idPkg", PACKAGING_NS)
+        .with_attr("DOMVersion", DOM_VERSION)
+        .with_attr("Self", self_id)
+        .with_attr("StoryList", story_list)
+        .with_attr("Name", name)
+        .with_attr("ZeroPoint", zero_point)
+        .with_attr("ActiveLayer", active_layer)
+}
+
+/// An `idPkg` reference in `designmap.xml` to a part stored at `src`.
+pub fn designmap_include(kind: &str, src: &str) -> El {
+    El::new(format!("idPkg:{kind}")).with_attr("src", src)
+}
+
 /// Parses a part into its root element with [`xml_limits`].
 ///
 /// Names are kept as written (`idPkg:Story`), text is kept exactly (it is story content), CDATA