--- /dev/null
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+ <head>
+ <title>A Core Calculus for XQuery 3.0</title>
+
+ <meta http-equiv="Content-Type"
+ content="text/html; charset=utf-8" />
+ <meta name="copyright"
+ content="Copyright © 2013 Kim Nguyễn" />
+
+ <!-- Load jQuery -->
+ <script src="../jquery-2.0.3.min.js" type="text/javascript" ></script>
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+ <!-- Load a custom Theme, the class-element marks this style-sheet
+ a "theme" that can be swtiched dynamicaly -->
+ <link class="sws-theme" rel="stylesheet" title="U-Psud style" href="../themes/uPsud.css" type="text/css" />
+
+ <!-- Customize some templates and initialize -->
+
+ <script type="text/javascript">
+ SWS.Config['sws-slide-change'] = SWS.Effects.slideChangeFadeOutIn;
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+ </style>
+ </head>
+ <body>
+ <div class="sws-slide sws-cover sws-option-nofooter">
+ <h1 style="font-size:200%;position:relative;top:-1em;">A Core Calculus for XQuery 3.0</h1>
+ <h3>Combining Navigational and Pattern-Matching Approaches</h3>
+ <div style="text-align:center;">
+ <table style="display:inline-block">
+ <tr>
+ <td>Giuseppe Castagna<sup>1</sup></td>
+ <td>Hyeonseung Im<sup>2</sup></td>
+ </tr>
+ <tr>
+ <td><u>Kim Nguyễn</u><sup>3</sup></td>
+ <td>Véronique Benzaken<sup>3</sup></td>
+ </tr>
+ </table>
+ </div>
+ <p style="font-size:80%;position:absolute;bottom:2.5em;left:4em;">
+ CNRS, PPS, Université Paris-Diderot, Paris, France <br/>
+ Kangwon National University, Chuncheon, Rep. of Korea<br/>
+ LRI, Université Paris-Sud, Orsay, France
+ </p>
+ </div>
+ <div class="sws-slide">
+ <h1>XQuery 3.0</h1>
+ <p>W3C standard language for querying XML
+ databases/documents</p>
+<code style="background:white">
+ declare function <u>get_links</u>(<u>$page</u>, <u>$print</u>) {
+
+ <span class="for">for</span> <u>$i</u> <span class="for">in</span> <u>$page</u><span class="xpath">/descendant::a[not(ancestor::b)]</span>
+ <span class="for">return</span> <u>print</u>(<u>$i</u>)
+ }
+
+ declare function <u>pretty</u>(<u>$link</u>) {
+ <span class="ts">typeswitch</span>(<u>$link</u>)
+ <span class="ts">case</span> <u>$l</u> <span class="ts">as element(a)</span>
+ return <span class="sw">switch</span> (<u>$l</u><span class="xpath">/@class</span>)
+ <span class="sw">case</span> "style1"
+ return <a href={<u>$l</u><span class="xpath">/@href</span>}><b>{<u>$l</u><span class="xpath">/text()</span>}</b></a>
+ default return <u>$l</u>
+
+ <span class="ts">default return</span> <u>$link</u>
+ }
+</code>
+ <script type="text/javascript">
+ reg ("0", col_change(".xpath, .for, .ts, .sw",""));
+ reg ("1", col_change(".xpath", "#f80"));
+ reg ("2", col_change(".for",""));
+ reg ("2", col_change(".for", "#290"));
+ reg ("3", col_change(".ts", ""));
+ reg ("3", col_change(".ts", "#80f"));
+ reg ("4", col_change(".sw", ""));
+ reg ("4", col_change(".sw", "#0f2"));
+ </script>
+ </div>
+ <div class="sws-slide">
+ <h1>XQuery 3.0</h1>
+ <ul>
+ <li>Pros<br/>
+ + standardized <br/>
+ + nice declarative syntax for paths
+ </li>
+ <li>Cons<br/>
+ - weird distinction between types/value case<br/>
+ - <s>no type-checking for functions</s>
+ </li>
+ </ul>
+ <p>It's a pity since XML <em>documents</em> are very precisely
+ typed (DTD, XMLSchemas)</p>
+ <p>Document type information is validated at runtime rather than
+ checked statically</p>
+ </div>
+ <div class="sws-slide">
+ <h1>&cduce;</h1>
+ <p>A polymorphic functional language (ML-style) equipped with
+ semantic subtyping</p>
+
+<code>
+ let <u>pretty</u> (<a>_ -> <a>_ & Any\<a>_ &rarrow; Any\<a>_)
+
+ | <a class="style1" href=<u>h</u> ..> <u>l</u> &rarrow; <a href=<u>h</u>>[ <b><u>l</u> ]
+ | x &rarrow; x
+
+
+ let <u>get_links</u> (page: <_>_) (print: <a>_ -> <a>_) : [ <a>_ * ] =
+
+ match page with
+ <a>_ & x &rarrow; [ (print x) ]
+ | < (_\‘b) > l &rarrow;
+ (transform l with (i & <_>_) &rarrow; get_links i print)
+ | _ -> [ ]
+
+
+
+
+</code>
+
+
+ </div>
+ <div class="sws-slide">
+ <h1>&cduce;</h1>
+ <ul>
+ <li>Pros<br/>
+ + Statically typed <br/>
+ + compact (and efficient) type and value pattern-matching
+ </li>
+ <li>Cons<br/>
+ - <s>complex navigation encoded through recursion</s>
+ - no type inference for functions
+ </li>
+ </ul>
+ <p>Writing functions to traverse documents is painfull</p>
+ </div>
+ <div class="sws-slide">
+ <h1>This work</h1>
+ <ol style="margin-left:1em; margin-right:0.25em;list-style-position:inside;">
+ <li id="tobox" style="padding:1em 0em 1em 0em;"><span class="lh">Add support for path navigation to
+ &cduce;</span>
+ <ul id="toshow" style="margin-top:2em;display:none;">
+ <li>Enrich the type algebra with <em>zippers</em> (à la Huet)</li>
+ <li>Extend pattern-matching construct to <em>zipped values and types</em></li>
+ <li>Encode path expressions as recursive patterns</li>
+ </ul>
+ </li>
+ <li style="padding:1em 0em 1em 0em;">Perform a type-directed translation from XQuery to
+ &cduce;</li>
+
+ </ol>
+ <script type="text/javascript">
+ reg ("0", col_change(".lh",""));
+ reg ("1", col_change(".lh", "#f80"));
+
+ reg ("2", function (canvas) { $("#toshow").show(); });
+ reg ("3", function (c) { $("#tobox").css (
+ { 'background' : '#dfd', 'border-radius': '1em' });});
+ </script>
+ </div>
+ <div class="sws-slide">
+ <h1>&cduce;'s type algebra</h1>
+<pre>
+ t ::= b | c | t × t | t &rarrow; t | t &lor; t | t &land; t | t ∖ t | ⊤ | ⊥ | α
+</pre>
+<p><dfn>b</dfn> : ranges over basic types (<tt>Int</tt>, <tt>String</tt>, …)<br/>
+ <dfn>c</dfn> : ranges over singleton types
+ (<tt>`A</tt>, <tt>42</tt>, …)<br/>
+ <dfn>α</dfn> : type variables<br/>
+ types are interpreted co-inductively (recursive types) and regular
+ expression types<br/>
+</p>
+<pre>
+ t<sub>1</sub> ≡ (<tt>Int</tt> × t<sub>1</sub>) &lor; t<sub>2</sub>
+ t<sub>2</sub> ≡ (<tt>Bool</tt> × t<sub>2</sub>) &lor; (<tt>Bool</tt> × <tt>`nil</tt>)
+
+ <span class="sws-pause">t<sub>1</sub> ≡ <tt>[ Int* Bool+ ]</tt></span>
+
+</pre>
+ </div>
+ <div class="sws-slide">
+ <h1>Semantic subtyping</h1>
+<pre style="text-align:center;">
+t ≤ s &Lrarrow; [t] ⊆ [s]
+</pre>
+<p><dfn>[ ]</dfn> interpretation of types as sets of
+ values<br/>
+ Allows to reason <i>modulo</i> semantic equivalence of type connectives :
+</p>
+<pre >
+ <tt>[ Int* (Int | Bool*)? ]</tt> &land; <tt>[ Int+ (Bool+ | Int)* ]</tt> ≡ <tt>[Int+ Bool*]</tt>
+</pre>
+</div>
+<div class="sws-slide">
+ <h1>&cduce; patterns</h1>
+<pre style="text-align:center;"> p ::= t | p | p | p & p | (p, p) | x </pre>
+<p><dfn>t</dfn> ranges over types<br/>
+ <dfn>x</dfn> ranges over capture variables<br/>
+ patterns are also co-inductively interpreted (recursive patterns)
+</p>
+<p><dfn><u>v / p</u></dfn> : matching a value against a pattern yields a
+ substitution from variables to values<br/>
+ <dfn><u>&lbag; p &rbag;</u></dfn> : the set of values accepted by a
+ pattern is <u>a type</u><br/>
+ <dfn><u> t / p</u></dfn> : matching a type against a pattern yields a
+ substitution from variables to types<br/>
+</p>
+</div>
+<div class="sws-slide">
+ <h1>&cduce; patterns (example)</h1>
+<p>Assume <tt><u>l</u></tt> has type <tt>[ Int+ Bool* ]</tt>, consider:</p>
+<code>
+ match <u>l</u> with
+ [ _* (<u>x</u> & Int) Bool* (<u>y</u> & Bool) ] &rarrow; (<u>x</u>, <u>y</u>)
+ | [ _* (<u>x</u> & Int) ] &rarrow; (<u>x</u>, `false)
+ | [ ] &rarrow; (0, `false)
+</code>
+<ol>
+<li><dfn>&lbag;<tt>[ _* (<u>x</u> & Int) Bool* (<u>y</u> & Bool) ]</tt>&rbag; ≡ <tt>[ ⊤* Int Bool+ ]</tt></dfn><br/>
+ yield : { x ↦ <tt>Int</tt>, y ↦ <tt>Bool</tt> }
+</li>
+<li><dfn>&lbag;<tt>[ _* (<u>x</u> & Int) ]</tt>&rbag; ≡ <tt>[ ⊤* Int ]</tt></dfn><br/>
+ yield : { x ↦ <tt>Int</tt> }
+</li>
+<li>Since <dfn><tt>[Int+ Bool* ]</tt> ∖ ( <tt>[ ⊤* Int Bool+ ]</tt> &lor; <tt>[ ⊤* Int]</tt>) ≡ ⊥ </dfn>
+ the third case is unreachable.
+</li>
+
+
+</ol>
+
+</div>
+<div class="sws-slide">
+<h1>&cduce; data-model</h1>
+<p>Sequences are nested pairs: <dfn><tt>[</tt> v<sub>1</sub> … v<sub>n</sub> <tt>]</tt> ≡ (v<sub>1</sub>, (…, (v<sub>n</sub>, <tt>`nil</tt>)))
+</dfn></p>
+<p>XML documents are tagged sequences: <pre style="text-align:center;"><tt><foo>[</tt> v<sub>1</sub> … v<sub>n</sub> <tt>]</tt> ≡ (<tt>`foo</tt>, <tt>[</tt> v<sub>1</sub> … v<sub>n</sub> <tt>]</tt>)</pre>
+</p>
+<p>Ususal lisp-like encoding of trees, how to perform navigation
+ (including upward ?)</p>
+</div>
+<div class="sws-slide">
+<h1>Zippers (1/2)</h1>
+<ul>
+ <li>Introduced in 1997 by Gérard Huet</li>
+ <li>Stack of visited</li>
+ <li>Push the current node on the stack when descending</li>
+ <li>Put the top of the stack and pop it to go backward</li>
+ <li>Tag the elements of the stack to remember which of a node we
+ have visited</li>
+</ul>
+<pre style="text-align:center;"> v ::= … | v<sub>δ</sub>
+ δ ::= &bcirc; | &left;v · δ | &right;v · δ
+</pre>
+
+</div>
+<div class="sws-slide">
+<h1>Zippers (2/2)</h1>
+<p><tt><u>fst</u></tt> (resp. <tt><u>snd</u></tt>) takes the first (resp. second)
+ projection of a pair and update its zipper accordingly:</p>
+<pre> v<sub>1</sub> ≡ (1, (2, (3, (4, `nil))))<sub>&bcirc;</sub>
+ v<sub>11</sub> ≡ fst v<sub>1</sub> ≡ 1<sub>&left;(1, (2, (3, (4, `nil))))<sub>&bcirc;</sub> · &bcirc; </sub>
+ v<sub>2</sub> ≡ snd v<sub>1</sub> ≡ (2, (3, (4, `nil)))<sub>&right;(1, (2, (3, (4, `nil))))<sub>&bcirc;</sub> · &bcirc; </sub>
+ v<sub>3</sub> ≡ snd v<sub>2</sub> ≡ (3, (4, `nil))<sub>&right;v<sub>2</sub> · &right;v<sub>1</sub> · &bcirc; </sub>
+</pre>
+<p><tt><u>up</u></tt> pops returns the head of the zipper: </p>
+<pre> up v<sub>3</sub> ≡ v<sub>2</sub> ≡ (2, (3, (4, `nil)))<sub>&right;(1, (2, (3, (4, `nil))))<sub>&bcirc;</sub> · &bcirc; </sub>
+</pre>
+</div>
+<div class="sws-slide">
+ <h1>Zipper types</h1>
+<p>We extend the type-algebra with zipper types:</p>
+<pre style="text-align:center;"> t ::= … | t<sub>τ</sub>
+ τ ::= &bcirc; | &left;t · τ | &right;t · τ | τ &lor; τ | τ ∖ τ | &ztop;
+</pre>
+<p><dfn>&bcirc;</dfn>: singleton type denoting the empty zipper<br/>
+ <dfn>&ztop;</dfn>: the top zipper types<br/>
+ Zipper types are interpreted co-inductively (regular expressions on
+ zippers)<br/><br/>
+ <dfn><tt>Int</tt><sub>(&left;⊤)* &bcirc;</sub></dfn>: type of
+ integers that are the leftmost descendant of a tree.<br/>
+ <dfn><tt><![CDATA[<html>[ <head>[…] <body>[…] ]]]></tt><sub>&bcirc;</sub></dfn>: type of
+ HTML documents<br/>
+ <dfn><tt><![CDATA[<a href=String>[ … ]]]></tt><sub>&ztop;</sub></dfn>: types of links in any context
+
+</p>
+</div>
+<div class="sws-slide">
+<h1>Tree navigation</h1>
+<p>Since patterns contain types, we can check complex
+ conditions:</p>
+<pre style="width:60%;display:inline-block;border-width:0pt 1pt 0pt 0pt; border-style:dashed;border-color: black;vertical-align:middle">
+ p ≡ <tt id="test"><a>_</tt> &lor; <tt><_>[ _* p _* ]</tt>
+
+ τ ≡ &bcirc; &lor; &right;⊤ · τ &lor; &left;(⊤∖ <tt><b>_</tt>) · τ
+
+</pre>
+<code style="width:20%;display:inline-block;vertical-align:middle">
+ match <u>v</u> with
+ <dfn>p<sub>τ</sub></dfn> & <u>x</u> &rarrow; …
+ | _ &rarrow; …
+</code>
+<p style="background:white">
+We want more, namely return <i>all</i> descendants (ancestor,
+ children, siblings, …) of a node matching a particular condition
+<br/><br/>
+Remark: (recursive) patterns <u>already perform a recursive traversal
+ of the value</u>
+<br/><br/>
+<em>Idea</em>: Piggy back on the traversal and <em>accumulate</em>
+nodes in special variables
+</p>
+<script type="text/javascript">
+ reg (0, col_change ("#test", ""));
+ reg (1, col_change ("#test", "orange"));
+</script>
+</div>
+<div class="sws-slide">
+ <h1>Operators and Accumulators</h1>
+<p>An <u>operator</u> is a 4-tupple <dfn>(o, n<sub>o</sub>,
+ &rleadsto;<sub>o</sub>, &rarrow;<sub>o</sub>)</dfn>, where:</p>
+<p><dfn><u>o</u></dfn>: is the accumulator name<br/>
+<dfn><u>n<sub>o</sub></u></dfn>: is the arity of <u>o</u><br/>
+<dfn><u>&rleadsto;<sub>o</sub></u></dfn>:
+&mathV;<sup>n<sub>o</sub></sup> &rsarrow; &mathV;, the reduction relation <br/>
+<dfn><u>&rarrow;<sub>o</sub></u></dfn>:
+&mathT;<sup>n<sub>o</sub></sup> &rsarrow; &mathT;, the typing relation <br/>
+</p>
+<p>An <u>accumulator</u> is a variable (ranged over
+ by <u>ẋ</u>, <u>ẏ</u>, …) with:<br/><br/>
+ <dfn><u>Op(ẋ)</u></dfn>: an operator<br/>
+ <dfn><u>Init(ẋ)</u> ∈ &mathV;</dfn> : an initial value<br/>
+</p>
+</div>
+<div class="sws-slide">
+ <h1>Some operators</h1>
+ <pre>
+ v, v' &rleadsto;<sup>cons,</sup> (v, v') <br/>
+ v, <tt>`nil</tt> &rleadsto;<sup>snoc</sup> (v, <tt>`nil</tt>)<br/>
+ v, (v',v'') &rleadsto;<sup>snoc</sup> (v', snoc(v,v''))<br/>
+ </pre>
+<p>Now we can use accumulators equipped with cons/snoc in
+ patterns. Instead of matching a single node against a variable, it
+ <u>accumulates</u> that node in sequence (in reverse or in-order).</p>
+</div>
+<div class="sws-slide">
+<h1>Pattern matching semantics (v/p)</h1>
+<pre style="text-align:center;">
+ σ; δ ⊢ v / p &rleadsto; γ, σ'
+</pre>
+<p style="font-size:90%"><dfn><u>σ</u>, <u>σ'</u></dfn>: mapping from accumulators to
+ values<br/>
+ <dfn><u>v</u></dfn>: input value<br/>
+ <dfn><u>p</u></dfn>: pattern<br/>
+ <dfn><u>γ</u></dfn>: mapping from capture variables to
+ values<br/>
+ <dfn><u>δ</u></dfn>: current context
+</p>
+<div style="padding:0em 1em 0em; text-align:justify;font-size:85%;background:white;">
+ <div class="infer">
+ <span> v ∈ [ t ]</span>
+ <span>σ; δ ⊢ v / t &rleadsto; ∅,
+ σ</span>
+ </div><span>(type)</span>
+
+ <div class="infer">
+ <span></span>
+ <span>σ; δ ⊢ v / ẋ &rleadsto; ∅,
+ σ[ ẋ := Op(ẋ) (v<sub>δ</sub>, σ(ẋ)) ]</span>
+ </div><span>(acc)</span>
+
+ <div class="infer">
+ <span></span>
+ <span>σ; δ ⊢ v / x &rleadsto; { x ↦ v },
+ σ</span>
+ </div><span>(var)</span>
+
+ <div class="infer">
+ <span>σ; &left;v · δ ⊢ (fst v)/p<sub>1</sub>
+ &rleadsto; γ<sub>1</sub>, σ' </span>
+ <span>σ'; &right;v · δ ⊢ (snd v)/p<sub>2</sub>
+ &rleadsto; γ<sub>2</sub>, σ''
+ </span>
+ <span>σ; δ ⊢ v /
+ (p<sub>1</sub>, p<sub>2</sub>) &rleadsto;
+ γ<sub>1</sub>∪ γ<sub>2</sub>,
+ σ''</span>
+ </div><span>(pair)</span> <span class="fill"></span>
+<span>… and some other rules for alternation, failure, recursion, <i>etc.</i></span>
+</div>
+</div>
+<div class="sws-slide">
+ <h1>Typing of patterns (with accumulators) 1/2</h1>
+ <p>Well known that typing path expressions escapes regular tree languages
+ (i.e. &cduce;'s types). Consider:
+ </p>
+<pre style="margin:-3em 0pt -1em;">
+ t ≡ <tt><c>[ <u><a>[]</u> t <u><b>[]</u> ] </tt> &lor; <tt><c>[]</tt> <img style="margin-left:3em;width:15%;vertical-align:middle;" src="anbn_tree.svg" alt="anbn"/>
+</pre>
+<p>The set of all <tt><u>a</u></tt> or <tt><u>b</u></tt> labeled
+ descendants
+ is <dfn>{ <tt>[<u><a>[]</u></tt><sup>n</sup> <tt><u><b>[]</u></tt><sup>n</sup> <tt>]</tt> | n ≥ 0 }</dfn>
+which is not a type.</p>
+<p> Intuitively it means that when applying a
+ recursive pattern against a recursive type, we may generate an
+ <s>infinite number of distinct types</s> for an accumulator.
+</p>
+</div>
+<div class="sws-slide">
+ <h1>Typing of patterns (with accumulators) 2/2</h1>
+ <p>We use the typing relation of operators to introduce
+ approximations:</p>
+ <pre>
+ <u>t<sub>0</sub></u>, <tt>[</tt> (t<sub>1</sub> &lor; … &lor; t<sub>n</sub>)<tt>* ]</tt> &rarrow;<sup>cons</sup> <tt>[</tt> (<u>t<sub>0</sub></u> &lor; t<sub>1</sub> &lor; … &lor; t<sub>n</sub>)<tt>* ]</tt> <br/>
+ <u>t<sub>0</sub></u>, <tt>[</tt> (t<sub>1</sub> &lor; … &lor; t<sub>n</sub>)<tt>* ]</tt> &rarrow;<sup>snoc</sup> <tt>[</tt> (<u>t<sub>0</sub></u> &lor; t<sub>1</sub> &lor; … &lor; t<sub>n</sub>)<tt>* ]</tt>
+ </pre>
+ <p>Ensures termination of typechecking of patterns.</p>
+</div>
+<div class="sws-slide">
+ <h1>Results</h1>
+<p>Zippers (in values, types, patterns) are orthogonal to the rest of the language</p>
+<ul>
+ <li><u>Subtyping and typechecking</u> are extended straightforwardly</li>
+ <li>Typing of patterns introduces <u>sound approximations</u> only for accumulators</li>
+ <li>Provided the operators are sound, the whole language remains <u>type-safe</u></li>
+</ul>
+</div>
+<div class="sws-slide">
+ <h1>From zippers to XPath</h1>
+ <p>We use <u>regular expressions</u> over basic &left;/&right; zippers to encode XPath</p>
+<code style="width:50%;float:left;"> <![CDATA[<a>[ <b>[
+ <c>[]
+ <d>[]
+ <e>[ <f> [] ]
+ ]
+ ]]]>
+</code><img style="width:17.5%;" src="ex_ntree.svg" alt="ex_ntree" /><br/>
+<p class="sws-pause"><img style="margin-top:-1em;margin-left:5%;width:85%;" src="rb_tree.svg" alt="rb_tree"/></p>
+</div>
+<div class="sws-slide">
+<h1>Downward axes</h1>
+<tt> <![CDATA[<a>[ <b>[ <c>[] <d>[] <e>[ <f> [] ] ] ]]]><sub>&bcirc;</sub></tt>
+<object id="svgRBTree" data="rb_tree.svg" type="image/svg+xml" style="margin-left:7.5%;width:85%" />
+<pre>
+ <tt>self ::</tt> t ≡ (ẋ <tt>&</tt> t | _ )<sub>&ztop;</sub>
+ <tt>child ::</tt> t ≡ <tt><_>[</tt> (ẋ <tt>&</tt> t | _ )<tt>* ]</tt><sub>&ztop;</sub>
+ <tt>descendant-or-self::</tt> t ≡ X ≡ ((ẋ <tt>&</tt> t | _ ) <tt> & <_>[</tt> X <tt>* ]</tt>)<sub>&ztop;</sub>
+ <tt>descendant</tt> :: t ≡ <tt><_>[ (descendant-or-self::</tt>t<tt>)* ]</tt><sub>&ztop;</sub>
+</pre>
+<!--
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+</div>
+<div class="sws-slide">
+<h1>Upward axes</h1>
+<tt> <![CDATA[<a>[ <b>[ <c>[] <d>[] <e>[ <f> [] ] ] ]]]><sub>&bcirc;</sub></tt>
+<object id="svgRBTree" data="rb_tree.svg" type="image/svg+xml" style="margin-left:7.5%;width:85%" />
+<pre>
+ <tt>parent ::</tt> t ≡ ⊤<sub> (&left;_) · (&right;_)* · (&right; ẋ & t) · (( (&left; _) · &ztop;) &lor; &bcirc; )</sub>
+ <tt>ancestor ::</tt> t ≡ ⊤<sub> ((&left;_) · (&right;_)* · (&right; ẋ & t))* · &bcirc; </sub>
+</pre>
+</div>
+<div class="sws-slide">
+ <h1>Other results</h1>
+<ul>
+ <li>Encoding of paths is compositional</li>
+ <li>Once we have path, translation from XQuery to &cduce; is straightforward</li>
+ <li>We also give a direct typing algorithm for XQuery 3.0 rather than typing the translation to &cduce;</li>
+</ul>
+</div>
+<div class="sws-slide">
+<h1>Conclusion, thoughts and future work</h1>
+<ul>
+ <li>Adding path expressions to a functional language such as &cduce; is possible </li>
+ <li>Semantic subtyping and regular expression types play nicely with zippers</li>
+ <li>In terms of language design, exposing directly zippers patterns to the programmer is a big no-no</li>
+ <li>Can also be applied to XSLT</li>
+ <li>Implementation on-going (including a &cduce; to javascript backend)</li>
+ <li>Extend the approach to Json (google ``path language for json''), i.e. generalise from products to extensible records</li>
+</ul>
+
+</div>
+
+ </body>
+</html>
--- /dev/null
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projects / hacks / simpleWebSlides.git / commitdiff
