License
=======
Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved.
This component and the accompanying materials are made available under the terms of the License 
"Eclipse Public License v1.0" which accompanies this distribution, 
and is available at the URL "http://www.eclipse.org/legal/epl-v10.html".

Introduction
============
Use the Linkcheck utility to check link validity in DITA xml files. 

There are many ways in which a link can be broken in DITA, using the linkchecker will not only tell you how many links are 
broken but also how they are broken.

For example:
* the integrity of ids is checked
* files are checked to see if they are orphaned 
* checks for cyclic references in maps

Prerequisites
=============
Run the linkcheck utility on DITA content that is ready to be built by the DITA Open Toolkit. This is content that has been 
created by Orb. See the Orb README.txt document for instructions if you haven't already done so. 

Running the linkcheck utility
=============================
For basic content analysis pass the path to your content to the linkchecker. For example:
python linkchecker.py C:\epoc32\release\doxygen\dita

This gives this analysis:
CMD: linkcheck.py C:\epoc32\release\doxygen\dita
2010-03-10 14:25:19,194 INFO     DitaFileSet starting to read...
2010-03-10 14:26:16,569 INFO     DitaFileSet.finalise() start...
2010-03-10 14:26:18,023 INFO     DitaFileSet.finalise() done.
================================ Statistics ===============================
                Maps:         12 [     0.000 M]
            Non-maps:       1800 [     0.002 M]
               Files:       1812 [     0.002 M]
               Bytes:   31891999 [    30.415 M]
                 IDs:      23208 [     0.022 M]
                Refs:      13928 [     0.013 M]
           Read time:     57.385 (s)
       Analysis time:      1.447 (s)
===========================================================================
============================== Error Summary ==============================
Code      Count Error
----      ----- -----
 401         63 Multiple id="..."
 410        349 Can not resolve reference to file "..."
 411         32 Can resolve reference to file "..." but not to fragment "..."
 414          1 topicref element with format="ditamap" does not match target root element "..."
 418       3828 Unknown referencing element "..." does not match target root element "..."
 419       2133 Unknown referencing element "..." does not match target element"..." for id="..."
 505         75 Duplicate id="..." in files: ...
 600       1311 Topic id="..." is not referenced by any map
 700         11 More than one top level map exists: ...
===========================================================================

Options
=======
The errors messages above can be expanded by using the command --file=specific. This will give all errors with the "..." filled 
in for each error found. This may return a lot of information, so use --errors with a space seperated list of the codes to report 
on. For example: 
python linkcheck.py --errors=700 --file=specific C:\epoc32\release\doxygen\dita

Returns the generic analysis table above plus this specific list:
Specific problems:
More than one top level map exists: C:/epoc32/release/doxygen/dita/GUID-1CDC3FD9-BD7B-3790-9856-607D01F59FE4.ditamap
More than one top level map exists: C:/epoc32/release/doxygen/dita/GUID-2F2463E0-6C84-3FAB-8B60-57E57315FDEB.ditamap
More than one top level map exists: C:/epoc32/release/doxygen/dita/GUID-445218BA-A6BF-334B-9337-5DCBD993AEB3.ditamap
...

More options
============
Use --help to see all options and -? to show all the tests that are performed and their codes.