"block">Whether array-element paths are written using start/end markers
 (see <a href="../../../../../com/fasterxml/jackson/dataformat/javaprop/JavaPropsSchema.html#Z:Z_indexMarker"><code>_indexMarker</code></a> or
 "simple" index number: if set to <code>true</code> AND markers
 are specified as non-empty Strings, will use sequence of
<pre>
   startMarker index endMarker
</pre>
 to include index in path; otherwise will simply use textual representation
 of the index number as path segment, prefixed by path 