Changes between Version 3 and Version 4 of MarkupPath

Timestamp:

Sep 1, 2006, 12:57:35 PM (18 years ago)

Author:

cmlenz

Comment:

Updated to match XPath support in 0.2 release.

MarkupPath

@@ -12 +12 @@
  * `descendant`
  * `descendant-or-self`
- * `namespace` (not completed yet)
  * `self`
 
-This means you can't use the ancestor, parent, or sibling axes in Markup. Basically, any path expression that would require buffering of the stream is not supported.
+This means you can't use the `parent`, ancestor, or sibling axes in Markup (the `namespace` axis isn't supported either, but what you'd ever need that for I don't know). Basically, any path expression that would require buffering of the stream is not supported.
 
-In addition, Markup does not (yet) support numeric types in XPath: everything is treated as text or booleans. For that reason, [http://www.w3.org/TR/xpath#NT-RelationalExpr relational] or [http://www.w3.org/TR/xpath#NT-AdditiveExpr additive] operators such as `>`, `<`, or `<=` are not supported right now.
+Predicates are of course supported, but Path expressions ''inside'' predicates are restricted to attribute lookups (again due to the lack of buffering).
 
-The following XPath functions are currently supported:
+Most of the XPath functions and operators are supported, however they (currently) only work inside predicates. The following functions are '''not''' supported:
 
- * `comment()`
- * `node()`
- * `processing-instruction(name?)`
- * `text()`
- * `not(expr)`
- * `local-name()` (the optional `node-set` parameter is not supported)
- * `namespace-uri()` (the optional `node-set` parameter is not supported)
- * `name()` (the optional `node-set` parameter is not supported)
+ * `count()`
+ * `id()`
+ * `lang()`
+ * `last()`
+ * `position()`
+ * `string()`
+ * `sum()`
+
+The mathematical operators (`+`, `-`, `*`, `div`, and `mod`) are not yet supported, whereas the various comparison and logical operators should work as expected.
+
+You can also use XPath variable references (`$var`) inside predicates.
 
 == Querying Streams ==