I am attempting to create an accessible PDF from a file that interleaves english and Farsi, which is a right to left language like Arabic or Hebrew. There will often be a paragraph of english text followed by a paragraph of its farsi translation. In documents that are entirely Farsi, Acrobat will infer that the text direction is RTL, but in mixed English/Farsi documents, the Farsi text reads from left to right. Is there a way to assign a text direction to a paragraph?
How are you creating the document? InDesign etc. can specify the language for a block of text, and where multiple languages are present in a document they should all be tagged with their respective entries. You can also set the language for a tagged block of text using the Content panel tools in Acrobat Pro.