Bug #2302: Node identity: collection() ↔ doc() - Saxon - Saxonica Developer Community

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Bug #2302

closed

Node identity: collection() ↔ doc()

Added by Christian Grün almost 10 years ago. Updated about 9 years ago.

Status:

Closed

Priority:

Normal

Assignee:

Category:

XSLT conformance

Sprint/Milestone:

9.6.0.5

Start date:

2015-02-02

Due date:

% Done:

100%

Estimated time:

Legacy ID:

Applies to branch:

9.6

Fix Committed on Branch:

9.6

Fixed in Maintenance Release:

9.6.0.5

Platforms:

Description

Hi Michael,

I believe the following query should yield true when applied on a directory 'dir' with a single XML file 'doc.xml'. Instead, it yields 'false':

collection('dir') is doc('dir/doc.xml')

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Updated by Michael Kay almost 10 years ago

Category set to XSLT conformance
Status changed from New to Resolved
Priority changed from Low to Normal

Yes, the stability of collections is a known conformance issue. When the standard (default) CollectionURIResolver is used, collections are not stable. In several respects: repeated calls on collection() with the same URI may return different sets of documents, the contents of individual documents may change, and the identity of documents is not necessarily the same as the identify of a document retrieved directly using the doc() function.

These issues will be addressed in Saxon 9.7, which will give the user control over whether to incur the costs associated with stability of collections.

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Updated by Michael Kay almost 10 years ago

For reference, here's how it will work in 9.7:

Collections can now be stable, meaning that multiple calls with the same collection URI are guaranteed to

    return the same results. For conformance with the specifications, this is the default, although it can be

    expensive, because the contents of a collection have to be maintained in memory just in case it is used

    again. Collection stability can be switched off in several ways: the collection URI can include the query

    parameter <code>stable=no</code>; the collection URI resolver can return the property value <code>stable="false"</code>

    in the <code>Properties</code> object supplied to the <code>resolve()</code> method; or the Configuration

    property <code>FeatureKeys.STABLE_COLLECTION_URI</code> can be set to false.</p>

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