Updates for Developing with PDF Page 2, 2nd paragraph under "Boolean Objects" header typo: "capatilization" s/b spelled "capitalization" in: "However, if you are reading/parsing a PDF and wish to be tolerant, be aware that poorly written PDFs may use other capatilization forms,..." Page 4, example 1-4. Strings the text is described as text with a leading BOM (byte order mark), but a BOM is FEFF, not FFFE see https://en.wikipedia.org/wiki/Byte_order_mark Page 8, 4th Paragraph, just above Example 1-8 "steam" instead of "stream": "Example 1-8 shows what a steam object in PDF might look like." Page 22, top on this page, for 4 0 obj At top on p.22, for "4 0 obj", you wrote "/Count 3". But there are only 2 "page" in this "4 0 obj" ("5 0 R" and "6 0 R"). Should it be "/Count 2"? At line 4 in the paragraph below Figure 1-7, you wrote "...along with a count of the leaf nodes in this branch of the tree....." In Example 1-16 (p.21), you wrote "/Count 3". But "2 0 obj" has 7 "page" (leaf nodes), if "2 0 obj" is the root of the page tree in Figure 1-7. I would like to know: the value of the key /Count is: -the number of (immediate) kids (include "pages" and "page") of a "pages"? (If it is this case, it should be /Count 3 for "2 0 obj" and /Count 2 for 4 0 obj) -or the total number of (immediate or descendant) "page" (leaf node) of a "pages"? (If it is this case, it should be /Count 7 for "2 0 obj" and /Count 2 for 4 0 obj) Note from the Author or Editor: Yes, it should - good catch, thanks! Page 35, 36, Example 2-8 I didn't understand that the numbers that appear in this example: ..... 350 227.6 327.6 250 300 250 c 272.4 250 250 227.6 250 200 c .... At last line In the first paragraph of p. 36, you mentioned: "....using a control point about 0.6 units from the end point" But why such numbers 227.6, 272.4, 172.4, 327.6 appear? Page 61, Example 1-19 The example provides /UserUnit 2.0 % 144 units/inch (2 * 72) Should be: /UserUnit 2.0 % 36 units/inch (2 * 1/72) Page 68, Example 4.2 four different fonts object 13 is defined twice, it is the second and the fourth object defined, the combined /Font definition is object 13 and also references object 13 naming it /F2