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doc.go
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// seehuhn.de/go/pdf - a library for reading and writing PDF files
// Copyright (C) 2023 Jochen Voss <voss@seehuhn.de>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
// Package numtree implements PDF number trees.
//
// Number trees map integers to PDF objects. In PDF files these trees are used
// in two differnt contexts:
// - The `PageLabels` entry in the document catalog is a number tree
// defining page labels for the pages in the document.
// - The `ParentTree` entry in the structure tree root dictionary
// is a number tree used in finding the structure elements
// to which content items belong.
package numtree