Fails to process FIXatdl test files

[donmendelson]

• Throws NullPointerException if XML root element attribute does not have a prefix for namespace.

[donmendelson]

• Merge fails in case an XML namespace does not have a prefix.

It handles <core:Strategies xmlns:core="http://www.fixprotocol.org/FIXatdl-1-1/Core" but not <Strategies xmlns="http://www.fixprotocol.org/FIXatdl-1-1/Core"

[donmendelson]

The namespace issue can be dealt with my registering the Core namespace with default prefix, defined as "". Then every element without a prefix is interpreted as belonging to the Core namespace by the XPath processor. (Attributes are unqualified).

[donmendelson]

The element comparator looks for special attributes "id" and "name" as keys. The FIXatdl files have "ID" as key. Change attribute comparison to be case insensitive to improve accuracy.

[donmendelson]

There seems to be an inconsistency between the Saxon XML parser and XPath engine with regard to default namespace handling. The parser correctly evaluates a node in the default namespace, but the XPath engine evaluates to no namespace if there is no prefix. Therefore, the merge utility fails to find the target of an operation--the local name matches but the URI does not. This is true even when the default namespace is registered with "" prefix--the XPath engine does not look it up.

[donmendelson]

An node in the default namespace is written to diff file as an EQname , e.g. "/Q{http://www.fixprotocol.org/FIXatdl-1-1/Core}Strategies". This should be considered for all paths on the chance that the xml files to be compared use different prefixes for the same namespace.

[donmendelson]

Reviewed by FIXatdl working group on Aug. 8.

[donmendelson]

Consider moving xml diff/merge to its own repository since it is general purpose, not specific to Orchestra