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Re: ANN: The Simple, Powerful Schema Language (SPSL)

• From: Dimitre Novatchev <dnovatchev@gmail.com>
• To: "Costello, Roger L." <costello@mitre.org>
• Date: Wed, 19 Dec 2012 08:54:06 -0800

Great idea,

It may be even more useful to evaluate the expressions one by one, so
that the exact reason for a validation error would be known.

Also, have a look at the new XSLT 3.0 instruction <xsl:assert> :

http://www.w3.org/TR/xslt-30/#element-assert

Cheers,
Dimitre

On Wed, Dec 19, 2012 at 4:52 AM, Costello, Roger L. <costello@mitre.org> wrote:
> Hi Folks,
>
> I am pleased to announce a new schema language called:
>
>      The Simple, Powerful Schema Language (SPSL)
>
> SPSL is very easy to learn. It takes less than one minute to learn the entire language.
> SPSL is very powerful. With it you can express any business rule that you could possibly imagine.
>
> An SPSL Validator is used to validate XML instance documents against an SPSL schema.
> SPSL Validators are free and customizable.
> Below I give you the code for the SPSL Validator -- the code is just a handful of lines long.
> The SPSL Validator builds on top of existing standard technologies so it has a strong foundation. As the foundation evolves to more power, so does the SPSL Validator.
>
> By using the SPSL language and the SPSL Validator you can save a lot of time and money.
>
> Here is the SPSL language and the SPSL Validator:
>
> ---------------------------------------------------------
> The Simple, Powerful Schema Language (SPSL)
> ---------------------------------------------------------
> The root element is <Schema>
> The content of <Schema> is one or more <Assert> elements.
> The content of each <Assert> element is a boolean XPath expression.
>
> <Schema>
>     <Assert>... XPath ...</Assert>
>     <Assert>... XPath ...</Assert>
>     <Assert>... XPath ...</Assert>
>    ...
> </Schema>
>
> An XML instance document is valid if each XPath expression evaluates to true.
>
> --------------------------------------------------------------------
> The Simple, Powerful Schema Language (SPSL) Validator
> --------------------------------------------------------------------
> The SPSL Validator is implemented in XSLT/XPath -- it leverages existing technologies.
>
> XML instance documents are validated against an SPSL schema using the <xsl:evaluate> element in XSLT 3.0
>
> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
>                            xmlns:xs="http://www.w3.org/2001/XMLSchema"
>                            version="3.0">
>
>     <xsl:variable name="schema" select="doc('schema.xml')" />
>
>     <xsl:template match="Schema">
>         <xsl:evaluate xpath="string-join($schema//Assert,',')" as="xs:boolean*"/>
>     </xsl:template>
>
> </xsl:stylesheet>
>
> /Roger
>
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-- 
Cheers,
Dimitre Novatchev
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• References:
  • ANN: The Simple, Powerful Schema Language (SPSL)
    • From: "Costello, Roger L." <costello@mitre.org>