Candle Runtime's Standards Compatibility Reference

Version	: Candle 0.11
Published date	: Mar 4, 2012

Unicode Support

UTF8 is the only encoding scheme supported by Candle's markup and script.

Current implementation uses UTF16 for internally string representation and has limited support of unicode surrogates. In certain operations, like string length calculation, the result will not be correct.

XML and XML Namespace Support

Candle has compatible XML support.

Current implementation has several limitations:

Only UTF8 encoding scheme is supported;

Tag name only supports ASCII chars, i.e.:

`NameStartChar`	::=	`":" \| [A-Z] \| "_" \| [a-z]`
`NameChar`	::=	`NameStartChar \| "-" \| "." \| [0-9]`
`Name`	::=	`NameStartChar (NameChar)*`

DTD is not supported, thus only XML's predefined entity references are supported;

XQuery Support

Candle runtime shall provide fully compatible XQuery support.

Current implementation has the following limitations:

Data Model:

integer: current implementation uses 32 bit int, thus does not have arbitrary precision;
decimal: current implementation use 64 bit double, thus does not have arbitrary precision, and may have rounding errors;

Full XPath support;

except element(...), schema-element(...), attribute(...), document-node() kind tests;

Expressions:

supported operators: +, -, *, div, idiv, mod, eq, ne, lt, le, gt, ge, is, <<, >>, or, and, union, intersect, except, FLWOR expr, if expr, some every expr;
operators not supported: =, !=, <, <=, >, >=, type switch expr, instance of, cast as, castable as, treat as, validate expr;
computed constructors are not supported;

Prologs:

supported: Default Collation Declaration, Ordering Mode Declaration, Module Import, Namespace Declaration, Default Namespace Declaration, Function Declaration, Option Declaration
not supported: Version Declaration, Module Declaration, Boundary-space Declaration, Base URI Declaration, Construction Declaration, Empty Order Declaration, Copy-Namespaces Declaration, Schema Import, Variable Declaration

Built-in Functions:

supported: true(), false(), not(), count(), sum(), avg(), max(), min(), root(), zero-or-one(), one-or-more(), exactly-one(), distinct-values(), position(), last(), current-dateTime(), current-date(), current-time()
other functions not supported;

Static Analysis and Schema Validation are not supported;