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revision 1.85 by hemppah, Tue Feb 4 14:08:42 2003 UTC revision 1.86 by benja, Wed Feb 5 20:27:59 2003 UTC
# Line 45  computers: being sent as e-mail attachme Line 45  computers: being sent as e-mail attachme
45  published on the web, moved between desktop and laptop systems,  published on the web, moved between desktop and laptop systems,
46  downloaded for off-line reading or copied between computers in a LAN.  downloaded for off-line reading or copied between computers in a LAN.
47  Furthermore, the same document is independently modified  Furthermore, the same document is independently modified
48  on two (or more) unconnected, separete systems. We address two issues  on two (or more) unconnected, separete systems. We use
49  raised by this ad hoc *data mobility* (see footnote) phenomenon: Dangling links,  *data mobility* as a collective term for the movement of documents
50  and keeping track of alternative versions. Resolvable location independent identifiers  between computers (or locations on one computer, such as folders),
51    and movement of content between documents (through copy&paste) [#]_.
52    
53    .. [#] While the physical mobility of e.g. notebooks may introduce
54       data mobility (for example due to caching for off-line access),
55       XXX
56    
57    We address two issues raised by data mobility:
58    Dangling links and keeping track of alternative versions.
59    Resolvable location independent identifiers
60  make these issues much easier to deal with, since data  make these issues much easier to deal with, since data
61  can be recognized whereever it is moved. The design also allows for  can be recognized whereever it is moved. {{The design also allows for
62  automatic balancing of the load, which occurs in location-dependent  automatic balancing of the load, which occurs in location-dependent
63  situations with popular items.  situations with popular items.}}
   
 footnote: we emphasize the mobility of *data*. Indeed, technology used  
 for transferring data is not our primary concern. On the other hand, the  
 mobility of people is obviously a particular reason for data mobility.  
 For data mobility, the mobility of people shows as the mobility of the  
 data processing devices, between/among which the data is shared  
 (transferred). XXX Hence, solving issues of data mobility may address e.g.  
 problems of mobile hypermedia.  
64    
65  In this paper, we present Storm (for *storage module*), a design  In this paper, we present Storm (for *storage module*), a design
66  for dealing with these issues. Storm provides an interface to  dealing with these issues. Storm is a library
67  applications for storing and retrieving data in immutable  for storing and retrieving data in immutable
68  byte sequences identified by cryptographic content hashes  byte sequences identified by cryptographic content hashes
69  [ref ht'02 paper], unifying the namespaces of  [ref ht'02 paper], unifying the namespaces of
70  private data and documents published on the Internet by  private data and documents published on the Internet by
71  using the same identifiers for both.  using the same identifiers for both. Storm provides services
72    for storing versioned data and Xanalogical storage [ref].
73    The Storm design, a hypermedia system built to make use
74  The main contributions of this paper are  of the emerging peer-to-peer search technologies,
75  -Storm - design which employs new techniques for hypermedia  is the main contribution of this paper.
 systems (location independent identifiers, immutable block storage, *working* links etc.)  
 -use of p2p architecture in hypermedia domain  
76    
77  Currently, Storm has been partially implemented as a part of the Gzz  Currently, Storm is partially implemented as a part of the Gzz
78  project [ref], which uses Storm exclusively for all disk storage.  project [ref], which uses Storm exclusively for all disk storage.
79  Gzz provides a general platform for building hypermedia applications upon.  Gzz provides a general platform for building hypermedia applications upon.
80  On top of Storm, we have built a system for storing mutable, versioned data  On top of Storm, we have built a system for storing mutable, versioned data
# Line 89  without changing applications substantia Line 88  without changing applications substantia
88  of our implementation of Xanalogical storage is to be taken.  of our implementation of Xanalogical storage is to be taken.
89  (Vitali [ref] notes that Xanalogical storage necessiates  (Vitali [ref] notes that Xanalogical storage necessiates
90  strong discipline in version tracking, which current systems lack.)  strong discipline in version tracking, which current systems lack.)
91  Investigating the degrees of interoperability with (other) Open Hypermedia  Investigating the degrees of interoperability with Open Hypermedia
92  (/Structural Computing?) and (more primitive?) other (Web) XXX is a possible  (/Structural Computing?) and (more primitive?) other (Web) XXX is a possible
93  direction for future work, and will be preliminarly discussed here too.  direction for future work, and will be preliminarly discussed here too.
94    [benja says: Really? Do we/can we discuss that really?]
95    
96  This paper is structured as follows. In next section, we describe  This paper is structured as follows. In next section, we describe
97  related work. In section 3, we introduce the basic storage unit of our  related work. In section 3, we introduce the basic storage unit of our
# Line 109  Section 9 concludes the paper. Line 109  Section 9 concludes the paper.
109  currently split in two - hinting somewhere in the beginning and reviewing at  currently split in two - hinting somewhere in the beginning and reviewing at
110  the and).  the and).
111  [In appendix A ? -Hermanni]  [In appendix A ? -Hermanni]
112    [IMHO: Use cases in intro, discussion on how Storm applies to them
113    to the end/in Conclusions. -b]
114    
115    
116  2. Related Work  2. Related Work

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