Hi, Nachiketa:
Several XML modelling experts advocate against putting semantics in attribute
value strings.
In particular, MarkLogic can index usefully if you move the semantics out of
attribute strings and into element or attribute names, as in:
<currency>dollar</currency>
You can then create a range index on currency and generate tuples with the
co-occurrence of document uris and currency values, which will let you group
document uris on the currency values.
If you can't do that, one alternative is to read all of the documents into maps
where the keys are the names and the values are uris. Reading all of the
documents has severe scalability problems, which is why it is better to modify
the model to make it possible to use indexes.
Hoping that helps,
Erik Hennum
________________________________
From: [email protected]
[[email protected]] on behalf of Nachiketa Kulkarni
[[email protected]]
Sent: Thursday, March 06, 2014 3:31 AM
To: [email protected]
Subject: [MarkLogic Dev General] query for getting linked documents
Hi,
Please consider the below case:
Document 1:
<doc>
<item name=”fruit” value=”apple”/>
<item name=”color” value=”red”/>
<item name=”car” value=”alto”/>
<item name=”currency” value=”dollar”/>
</doc>
Document 2:
<doc>
<item name=”vegetable” value=”okra”/>
<item name=”fruit” value=”apple”/>
<item name=”car” value=”swift”/>
<item name=”currency” value=”dollar”/>
</doc>
Document 3:
<doc>
<item name=”fruit” value=”banana”/>
<item name=”color” value=”blue”/>
<item name=”car” value=”verna”/>
<item name=”currency” value=”rupee”/>
</doc>
Referring to the above example, two or more documents are said to be linked if
the item element with @name = currency and their @value matches. Thus, in the
above case, document 1 is linked to document 2 but not document 3.
In order to get the URIs of all the linked document, I think of using the
following approach:
Since attribute range indexes on both @name and @value are available, all the
matching @value for which @name = currency can be grouped together. Once all
the groups are obtained, I will return the URI of the documents from each
group. Using the URIs, I will add an element in each of the documents from a
group which will serve as a link between them.
However, I am not sure how I can form groups just by referring to range
indexes. Please help me construct the XQUERY to get the desired result.
Thanks and Regards,
Nachiketa
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