anchor.diff:  |Attribute: fileName|+<depends basedir="a" filename="b">+ is a shorthand notation of +<depends basedir="a"> <filename name="b"/>+.| No; see note
   |Attribute: file|+<depends file="a/b">+ is a shorthand notation of +<depends basedir="a"> <filename name="b"/>+.| No; see note
   |Element: _file selector_|An selector which limits application of this dependency. | No; can appear at most once; see note
  -|Element: _resource collection_|The referenced resources represented by Ant resource collections. | No; can appear arbitrary number of times, but at least either a _resource collection_ or a _despends_ element must be specified.
  +|Element: _resource collection_|The referenced resources represented by Ant resource collections. | No; can appear arbitrary number of times, but at least either a _resource collection_ or a _depends_ element must be specified.
   |Element: _depends_|Nested dependency. | No; can appear arbitrary number of times, but at least either a _depends_ element or a _resource collection_ must be specified.
   |=================
   
  
positive.code: 
  |meta|An instruction that the driver shall put a processing instruction (PI) which includes the meta-information of the original source document. The PIs shall be put as the first children of the document element. If there are multiple PIs to be put, their document order shall be the same as the order of these elements. | No; can be appear arbitrary number of times
  
  |namespace|A pair of a namespace prefix and a namespace name which is mapped from the prefix. This mapping is used by descentant _Transform_, _All_ and _Snip_ drivers.| No; can appear arbitrary number of times
  
  |depends|Dependency between resources applied to the orignal source documents. This information are used only to decide whether the corresponding outputs are up to date. +
  For details, see <<dependency.depends, "Depends element">> section. | No; can appear at most once
  
negative.code: Multiple fragments generated by a Snip filter:: In this case, the _Snip_ filter passes them to its sinks in parallel.
  
  It is notable that an _All_ filter is an end point of parallel execution, for _All_ filters inherently have to wait for all the source documents to be accumulated.
  Of course, if there is a _Snip_ filter in descendant of an _All_ filter, it will be a beginning point of parallel execution again.
  
  All Chionographis tasks share one common thread pool for parallelism.
  So if you run multiple Chinograhis tasks simultaneously in an Ant's _Parallel_ task, they are likely to share the resource
  