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mended to put the direct elements before the first child elements.Structure items with mixed types of children (i.e., both page content sequences andnon-inline structure elements) should be avoided since otherwise Reflow may fail.> The BBox option should be provided for tables and illustrations. The BBox should beexact; however, for tables only the lower left corner has to be set exactly. As an alternativeto supplying a BBox entry, graphics could also be created within a BLSE tag,such as P, H, etc. However, vector graphics will not be displayed when Reflow is active.If the client does not provide the BBox option (and relies on automatic BBox generationinstead) all table graphics, such as cell borders, should be drawn outside the tableelement.> Table elements should only contain table-related elements (TR, TD, TH, THead, TBody,etc.) as child elements, but not any others. For example, using a Caption elementwithin a table could result in reflow problems, although it would be correct TaggedPDF.> Content covered by the Private tag will not be exported to other formats. However,they are subject to Reflow and Read Aloud, and illustrations within the Private tagmust therefore have alternate text.> Reflow seems to have problems with PDF documents generated with the topdownoption.> Structure items with mixed types of children (i.e., both page content sequences andnon-inline structure elements) should be avoided since otherwise Reflow may fail.> If an activated item contains only content, but no structure children, Reflow mayfail, especially if the item is activated on another page. This problem can be avoidedby wrapping the activated item with a non-inline Span tag.> Acrobat cannot reflow pages with form fields, and will display a warning in this case.> Acrobat 9 cannot reflow pages with digital signature fields, and will display a warningin this case.> Every reflow problem disables the reflow feature and disables its menu item.Acrobat’s Accessibility Checker. Acrobat’s accessibility checker can be used to determinethe suitability of Tagged PDF documents for consumption with assisting technologysuch as a screenreader. Some hints:> In order to make form fields accessible, use the tooltip option of PDF_create_field( )and PDF_create_fieldgroup( ).> Acrobat 7: If the Lbl tag is set within the TOCI tag (as actually described in Adobe’s PDFreference) the Accessibility Checker in Acrobat 7 will warn that the Lbl tag is not setwithin an LI tag.> If a page contains annotations, Acrobat reports that »tab order may be inconsistentwith the structure order«.Export to other formats with Acrobat. Tagged PDF can significantly improve the resultof saving PDF documents in formats such as XML or RTF with Acrobat.> If an imported PDF page has the Form tag, the text provided with the ActualText optionwill be exported to other formats in Acrobat, while the text provided with theAlt tag will be ignored. However, the Read Aloud feature works for both options.> The content of a NonStruct tag will not be exported to HTML 4.01 CSS 1.0 (but it will beused for HTML 3.2 export).> Alternate text should be supplied for ILSEs (such as Code, Quote, or Reference). If theAlt option is used, Read Aloud will read the provided text, but the real content will be9.6 Tagged PDF 223