====================== module Data ==============================
Data support.
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================== data like {pattern:data} -> type =============
Type spcifying data matching specified pattern.
Currently the pattern may only specify how the
data begins.
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sys_func#11

================= file {path:text} -> data ======================
Return data object representing file on specified path.
This is only temporary function and will be removed 
in future releases.
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sys_func#12

==================== hex {d:text} -> data =======================
Represent hex encoded text as binary data.
For example hex "000102030405060708090a0b0c0d 0E 0F" represents
16 bytes from 0 to 15.
Leters can be both upper and lower case. Spaces are ignored.
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sys_func#13

=============== size of {d:data} -> int =========================
Return size of the specified data object in bytes.
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sys_func#2

=========== {d1:data} & {d2:data} -> data =======================
Join two data objects.
Copy of the data is not created.
A modification of one of the source data is reflected to
joined data. 
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sys_func#4