item-0 at level 0: GroupLabel.UNSPECIFIED: group _root_
  item-1 at level 1: DocItemLabel.TITLE: Test Document
    item-2 at level 2: DocItemLabel.PARAGRAPH: 
    item-3 at level 2: DocItemLabel.SECTION_HEADER: Section 1
      item-4 at level 3: DocItemLabel.PARAGRAPH: 
      item-5 at level 3: DocItemLabel.PARAGRAPH: Paragraph 1.1
      item-6 at level 3: DocItemLabel.PARAGRAPH: 
      item-7 at level 3: DocItemLabel.PARAGRAPH: Paragraph 1.2
      item-8 at level 3: DocItemLabel.PARAGRAPH: 
      item-9 at level 3: DocItemLabel.SECTION_HEADER: Section 1.1
        item-10 at level 4: DocItemLabel.PARAGRAPH: 
        item-11 at level 4: DocItemLabel.PARAGRAPH: Paragraph 1.1.1
        item-12 at level 4: DocItemLabel.PARAGRAPH: 
        item-13 at level 4: DocItemLabel.PARAGRAPH: Paragraph 1.1.2
        item-14 at level 4: DocItemLabel.PARAGRAPH: 
      item-15 at level 3: DocItemLabel.SECTION_HEADER: Section 1.2
        item-16 at level 4: DocItemLabel.PARAGRAPH: 
        item-17 at level 4: DocItemLabel.PARAGRAPH: Paragraph 1.1.1
        item-18 at level 4: DocItemLabel.PARAGRAPH: 
        item-19 at level 4: DocItemLabel.PARAGRAPH: Paragraph 1.1.2
        item-20 at level 4: DocItemLabel.PARAGRAPH: 
        item-21 at level 4: DocItemLabel.SECTION_HEADER: Section 1.2.3
          item-22 at level 5: DocItemLabel.PARAGRAPH: 
          item-23 at level 5: DocItemLabel.PARAGRAPH: Paragraph 1.2.3.1
          item-24 at level 5: DocItemLabel.PARAGRAPH: 
          item-25 at level 5: DocItemLabel.PARAGRAPH: Paragraph 1.2.3.1
          item-26 at level 5: DocItemLabel.PARAGRAPH: 
          item-27 at level 5: DocItemLabel.PARAGRAPH: 
    item-28 at level 2: DocItemLabel.SECTION_HEADER: Section 2
      item-29 at level 3: DocItemLabel.PARAGRAPH: 
      item-30 at level 3: DocItemLabel.PARAGRAPH: Paragraph 2.1
      item-31 at level 3: DocItemLabel.PARAGRAPH: 
      item-32 at level 3: DocItemLabel.PARAGRAPH: Paragraph 2.2
      item-33 at level 3: DocItemLabel.PARAGRAPH: 
      item-34 at level 3: GroupLabel.SECTION: group header-2
        item-35 at level 4: DocItemLabel.SECTION_HEADER: Section 2.1.1
          item-36 at level 5: DocItemLabel.PARAGRAPH: 
          item-37 at level 5: DocItemLabel.PARAGRAPH: Paragraph 2.1.1.1
          item-38 at level 5: DocItemLabel.PARAGRAPH: 
          item-39 at level 5: DocItemLabel.PARAGRAPH: Paragraph 2.1.1.1
          item-40 at level 5: DocItemLabel.PARAGRAPH: 
      item-41 at level 3: DocItemLabel.SECTION_HEADER: Section 2.1
        item-42 at level 4: DocItemLabel.PARAGRAPH: 
        item-43 at level 4: DocItemLabel.PARAGRAPH: Paragraph 2.1.1
        item-44 at level 4: DocItemLabel.PARAGRAPH: 
        item-45 at level 4: DocItemLabel.PARAGRAPH: Paragraph 2.1.2
        item-46 at level 4: DocItemLabel.PARAGRAPH: 
        item-47 at level 4: DocItemLabel.PARAGRAPH: