Filter replaces all variables ending in ., .url, .file, etc. with corresponding value from POM

A resource file (a Unix shell file) with this definition

: ${BASE_DIR:=..}

results in this after being filtered by the assembly plugin

: MavenProject: catmktg:FlexRxProject:T1.4.0 @ F:\FlexRx\checkouts\pom.xml

The expectation is that '..' would be left alone as there is no definition for this in our context. Turns out there is in ${project}, however. Specifying ${.url} and ${.file}, etc. result in replacements same as ${project.url} and ${project.file} as well. This seems like a bug but perhaps it is a feature that needs some refinement.

The workaround in our case is to quote the dots ('..') which works when using it in a Unix path. However, this may not suffice in other cases.

I've seen similar reports in MWAR-133 and MRESOURCES-20 but I cannot find a report in MASSEMBLY.