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unread_bytes (int) - the number of bytes currently contained in the read buffer.
unread_bytes (int) - the number of bytes currently contained in the read buffer.

a possible use for extract is to import into symbol table variables contained in an associative array returned by wddx_deserialize().
note that prefix is only required if extract_type is extr_prefix_same, extr_prefix_all, extr_prefix_invalid or extr_prefix_if_exists.

decrypts the s/mime encrypted message contained in the file specified by infilename using the certificate and it's associated private key specified by recipcert and recipkey.
decrypts the s / mime encrypted message contained in the file specified by infilename using the certificate and it 's associated private key specified by recipcert and recipkey.

besides the documents, all hyper links contained in a document are stored as object records as well. hyper links which are in a document will be removed from it and stored as individual objects, when the document is inserted into the database. the object record of the link contains information about where it starts and where it ends. in order to gain the original document you will have to retrieve the plain document without the links and the list of links and reinsert them (the functions hw_pipedocument() and hw_gettext() do this for you. the advantage of separating links from the document is obvious. once a document to which a link is pointing to changes its name, the link can easily be modified accordingly. the document containing the link is not affected at all. you may even add a link to a document without modifying the document itself.
other attributes like a description or keywords are potential candidates.