* Get a list of documents using \$xwiki.searchDocuments().   This returns a list of document names in string format, not a list of document objects.
* Iterate through the list using a \#foreach statement.  For each result:
** use \$xwiki.getDocument($docname) to obtain the document object
** Then use the document.getObject(\$objectname) function to obtain the object you're interested in
** Finally use object.getProperty(\$propname).getValue() to obtain the value of the desired property, and use this to determine whether this document meets your criteria