🍈 Zettelkasten

A file-format for documents that can be viewed on a web-browser.

Structure

Specifies the version number of a pdf

%PDF-2.0

Body

Comprised of objects:

Comments - %comment ends at \n
Booleans
Real Numbers
Integers
Names – /name
Strings – (text)
Arrays – ([...])
Dictionaries – (<<...>>). The key is a name object and the value can be any other object.
Streams – contains data, images or code. Often compressed. Represented by a dictionary that set the stream’s length with the key /Length and encoding /Filters. starts with stream ends with endstream
Indirect object – object that has a unique ID, the object starts with the keyboard obj and ends with endobj other objects can reference the object using its ID. For example a reference to object with ID 3 we would look like this: 3 0 R
Null objects

Starts with startxref for index table
Each entry starts with xref keyword
- Contains byte offset from start of file for each indirect object
If xref streams are not used, then contains trailer followed by a dictionary of references
%%EOF marker