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Use XPATH-PROTOCOL:NODE-EQUAL rather than EQ/EQL on nodes.  Use HASH-KEY
with an EQUAL hash table instead of nodes in an EQL hash table.

This change is motivated by the DOM-NAMESPACE and STP-NAMESPACE objects,
which are consed up every time they are queried, yet need to be compared
later.  The alternative solutions would have been
  - caching of those objects in DOM, which requires changes to the DOM
    implementation
  - force use of a navigator for STP and DOM (awkward)
Simply allowing duplicate nodes seems easier.

darcs-hash:b0ccd40b33df1274fccb89650090ff5340d9276b

"oops"

darcs-hash:124414697b6eca4a749814989db32489946b1315

Fixed xnum parsing / unparsing.
Fixed comparison operators.
Added lang() function.
Node sets returned by EVALUATE and EVALUATE-COMPILED now are automatically sorted
using document order by default.
Fixed following:: axis (again).
Fixed NODE-TEST-NAME for namespace nodes.
Numbers in XPath expressions are now never parsed into SINGLE-FLOAT.
Added SORT-NODE-SET function.

darcs-hash:f11136c9917dee6bd41d96f3e8950db389c78b55

darcs-hash:cbeecb1a3180fb0663c8e9f9cae929339ddc16a4

Added atdoc documentation templates (mostly copied from Xuriella).
Renamed xpath-protocol:string-value to xpath-protocol:node-text.
Added xpath-protocol:node-text method for namespace nodes.
Added list->node-set function (a simpler version of xpath-sys:make-node-set).

darcs-hash:5157e09c5e43012d65211d1fb22d6b544a75ee54

Fixed :following, :preceding-sibling, :following-sibling and :namespace axes.
Fixed contains() (what a shame! I made a mistake in the order of arguments).
Fixed translate().
Added get-node-id() and plx:generate-id() (same as generate-id() in XSLT).
Added checks for number of arguments passed to XPath functions.
Fixed a package-related problem in define-xpath-function/single-type.
Fixed xnum-round.

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darcs-hash:bfacee78d09841b9f911b77239e7c926329b0856

darcs-hash:d3828b9c30d4ea787fb181678a3db979fbd16f09

Switched to dynamic bindings.
Fixed "names" of character-data nodes.

darcs-hash:24a16eac985183f1bfd66894f0c3c94a001e5f57

darcs-hash:a201767c554006621d5f1872e32b2da2c919dc62

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darcs-hash:9dd87a2a69312e0beb21c574842c778200709655

Always require the second argument to COMPILE-XPATH.  We cannot see lexical
bindings in this function.

Replaced the function EVALUATE with EVALUATE-THUNK, which always takes a
closure as an argument, never a string or sexp.  (EVALUATE-THUNK is just
a working title for this function, perhaps a better name can be found.)

New macro EVALUATE, replacing the compiler macro.

Removed *LEXICAL-NAMESPACES* and *LEXICAL-VARIABLES*.
  - don't bind *LEXICAL-NAMESPACES* in WITH-NAMESPACES
  - don't bind *LEXICAL-VARIABLES* in WITH-VARIABLES

Export EVALUATE-THUNK from the package in addition to EVALUATE.

Added a test checking that the empty namespace can be used without
having to use WITH-NAMESPACES.

Removed the call to STRING in TEST-FILTERING.  (fixme?)

darcs-hash:55b42a4c50757f63616b05dccca0cac08aa84fb4

Helper function of the same name to signal this error.

Exported XPATH-ERROR.

Added another workaround for the non-error condition that parse-number
signals.

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darcs-hash:ed5d82a8ecee6fa2ff9f226148004c797a858445

Fixed:
  map-node-set
  do-node-set

Added node set iterators:
  make-node-set-iterator
  node-set-iterator-end-p
  node-set-iterator-next
  node-set-iterator-current

Exported:
  node-set-p

Added test for empty node sets:
  node-set-empty-p

darcs-hash:9e84b4035564a382ee3af2e16316bd1bb8854ab8

... allow both NIL and "" for the empty prefix.

... normalize to NIL

darcs-hash:819b651322611ac596ef0d803fa0e652cd79384e

  Reverted CONTEXT-VARIABLE-VALUE.

  Renamed ENVIRONMENT-VALIDATE-VARIABLE to ENVIRONMENT-FIND-VARIABLE,
  which now returns a closure rather than just a boolean.

  New exported macro WITH-VARIABLES for the LEXICAL-ENVIRONMENT.
  (And tests for that.)

darcs-hash:4bf3773ca6bd46e449833192b823a08f248a9175

Moved XPath parser to parser.lisp.

Moved some of toplevel API to api.lisp.

Added MAP-NODE-SET and DO-NODE-SET.

Added proper unary minus handling.

Added test cases for string representation of XPath in TEST-XPATH
(previously TEST-XPATH/UNABBREVIATED).

Made it possible to pass strings to compile-xpath.
STRING-VALUE, NUMBER-VALUE, BOOLEAN-VALUE and NODE-SET-VALUE now can handle single nodes.
Added XPATH-PROTOCOL:NODE-P.

Compiler macro for EVALUATE now issues warning instead of error if EVALUATE
is used outside lexical scope of (WITH-NAMESPACES (...) ...)

Added some of missing XPath functions - substring(), true(), false(),
boolean(), number()

darcs-hash:973601a675f33d9ebcd85ef89b6270e702fbaa1d

A new function EVALUATE is provided that...
  - automatically parses XPath strings.
  - also accepts sexps in the syntax (xpath (sexp-goes-here)).  (The special
    marker XPATH in the CAR is needed to distinguish literal strings from XPath
    strings.)
  - and accepts pre-compiled closures.  Users who want to use this function
    with a customized environment must pass precompiled closures.

For the first two cases, the environment is defined lexically using the
new macro WITH-NAMESPACES.

The context argument to ALL-NODES can be either...
  - an actual context
  - or any other node understood by the XPath protocol, and will then
    be turned into a trivial context automatically

A compiler macro on EVALUATE allows pre-compilation of closures at fasl
load time.  (Macrolet tricks propagate the information from WITH-NAMESPACES
into the compiler macro.  Thanks to chandler on #lisp for the tip.)

darcs-hash:88c7a7985b99372e14071fb9eb8da0bc97d0b054

darcs-hash:2d8860ef9e911e6597859b4fa6ea89a4138523bc

functions.lisp
        - new function XPATH:UNION for the | operator
          (not a keyword because not technically an XPath function)

lexer.lisp
	Lots of fixes.

node-tests.lisp
	- NODE-TEST-NAME
	  Added the namespace URI as an optional second argument.
	- NODE-TEST-NAMESPACE
	  New, checks only the namespace and not the local name.
	- NODE-TEST-PROCESSING-INSTRUCTION
	  Added the name to check as an optional argument.

types.lisp
	- CONTEXT-VARIABLE-VALUE
	  New generic function looking up variable values during
	  evaluation.
	- ENVIRONMENT
	  New struct, basically a compilation-time context.
	- ENVIRONMENT-FIND-NAMESPACE
	  New generic function for prefix -> uri lookups
	- ENVIRONMENT-FIND-FUNCTION
	  New generic function for (local-name uri) -> function lookups.
	- ENVIRONMENT-VALIDATE-VARIABLE
	  New generic function that returns true if the variable is
	  declared.
	- TEST-ENVIRONMENT
	  An environment that pretends to know about every namespace,
	  function, and variable. For use only in parser tests.

xpath.lisp

	- MAKE-LOCATION-STEP
	  Now accepts the list of predicates instead of just one
	  predicate.
	- COMPILE-PREDICATES
	  helper function for make-location-step
 	- DECODE-QNAME, FIND-NAMESPACE
	  New
	- COMPILE-XPATH
	    * New second argument `environment'.
	    * For function calls, check if the function name is a string
	      rather than a symbol, and if so, look it up in the enviroment.
	    * New: variables
	    * New: filters
	- COMPILE-VARIABLE
	  New
	- COMPILE-NODE-TEST
	  Split qnames.  And allow lists as node-tests to handle
	  :namespace, named :processing-instruction, and pre-parsed :qname
	- COMPILE-LOCATION-STEP
	    * New second argument `environment'.
	    * Accept multiple predicates.
	- COMPILE-PATH
	  New second argument `environment'.
	- COMPILE-FILTER-PATH
	  New

axis.lisp
	- new axis :namespace
	- new axis :following-sibling
	- new axis :preceding-sibling
	- new axis :following
	- new axis :preceding
	- new axis :ancestor-or-self
	and
	- pseudo axis :root  -- FIXME: is this right?

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