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This function scans the document and performs analysis of the
contents.
Scanning the document content involves decompressing and parsing
all the content in the document. As such it can be an expensive and
time consuming process for large or complex documents.
For this reason the analysis is cached the first time this
function is called. If you later change the content it is your
responsibility to call this function to ensure that the analysis is
updated.
Whole document analysis enables certain other optimizations such
as Font.Subset.
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