It’s close Alex.

I think it’s testing non-SVG images now so it leads to two errors for each image in the document. I think maybe I need to go back to the previous rule context.

<rule context="image[ends-with(@href, '.svg')]"> or maybe multiple rule contexts.

System ID: C:\dita\en\products\simon\images\Shock_Tilt_Watch_Indicators.JPG

Engine name: ISO Schematron (XSLT 2.0)

Severity: fatal

Description: Invalid byte 1 of 1-byte UTF-8 sequence.

Type: XML validation

Start location: 1:1

System ID: C:\dita\en\products\simon\service\VerifyContents.dita

Engine name: ISO Schematron (XSLT 2.0)

Severity: error

Description: The SVG file can't be loaded file:/C:/dita/en/products/simon/images/Shock_Tilt_Watch_Indicators.JPG ($svgExists) [assert]

Type: XML validation

Start location: 24:56

This is a great working example for me to play with. I’ll report back if I can get it straightened out.

Thanks!
Matt

From: Alex Jitianu [mailto:alex_jitianu@sync.ro]
Sent: Tuesday, July 30, 2013 9:35 AM
To: KAATMAN Matthew
Cc: oxygen-user@oxygenxml.com
Subject: Re: [oXygen-user] Feature request: Validation for linked images in SVG paths

Hello Matt,

1. The odd line is related to the fact that when validating with a Schematron file under the hood the Schematron is transformed in XSLT and that XSLT is applied on the document. The reported error line is inside that intermediate XSLT and unfortunately I don't think there is a round trip to get the real location in the Schematron file.

2. I believe the NullPointerException is a side effect of the fact that I didn't consider the fact that the SVG file is also referred relatively in the DITA document. As a result the SVG will not get located and parsed by the document() function and later on exists() function will break. In the example below I've added the resolve-uri() function to compute the SVG document location.

3. In the example below I've changed a bit the assert XPath to ignore the href values that start with 'data'. You should also take into account the fact that the SVG can contain multiple image elements. Perhaps you could assert it more elegantly than this but here a possible solution:

<schema
    xmlns="http://purl.oclc.org/dsdl/schematron"
    queryBinding="xslt2"
    xmlns:exslt="http://expath.org/ns/file">
    <ns uri="http://expath.org/ns/file" prefix="exslt"/>
    <pattern>
        <rule context="image">
            <let name="svgDocument" value="document(resolve-uri(@href, base-uri()))" />
            <let name="svgExists" value="exists($svgDocument)"/>
            <assert test="$svgExists">The SVG file can't be loaded <value-of select="resolve-uri(@href, base-uri())"/></assert>

            <let name="realImages" value="$svgDocument//*:image/@*:href"/>
            
            <let name="testImages" value="for $realImage in $realImages return if (not($svgExists) or starts-with($realImage, 'data')) then true() else exslt:exists(resolve-uri($realImage, base-uri($svgDocument)))"/>
            <assert test="empty(index-of($testImages, false()))">The image file must exist</assert>

        </rule>
    </pattern>
</schema>

Best regards,
Alex

On 30-Jul-13 3:33 PM, KAATMAN Matthew wrote:

Hey Alex,

This looks really promising!

When I run validate with this schematron I get the following:

System ID: C:\svn\scripts\svgCheck.sch

Engine name: ISO Schematron (XSLT 2.0)

Severity: fatal

Type: XML validation

Start location: 149:0 (Odd because the schematron is only 14 lines)

System ID: C:\dita\pt\products\vitek2systems\pi\Appendix_A.dita (This is the first file with an SVG for the document I checked.)

Engine name: ISO Schematron (XSLT 2.0)

Severity: error

Description: Exception thrown by extension function {public static boolean com.saxonica.functions.extfn.EXPathFile.exists(java.lang.String)}: java.lang.NullPointerException

Type: XML validation

Even if I delete all SVG references, I receive the above two errors.

I then tried it on a map with more SVGs and some that were verified to be broken. It is properly detecting the errors but I see false positives when the SVG contains embedded images instead of linked. I believe it’s trying to verify the binary data as the uri.

System ID: C:\dita\en\products\simon\service\Attachments.dita

Engine name: ISO Schematron (XSLT 2.0)

Severity: error

Description: A sequence of more than one item is not allowed as the first argument of resolve-uri() ("data:image/jpeg;base64,/9j/4AA...", "data:image/png;base64,iVBORw0K...")

Type: XML validation

Is there a way for me to adjust the schematron to ignore href values that start with “data”?

I had previously attended a webinar Oxygen presented on schematron. I’m finally starting to understand how powerful it can be!

Thank you,
Matt

From: oxygen-user-bounces@oxygenxml.com [mailto:oxygen-user-bounces@oxygenxml.com] On Behalf Of Alex Jitianu
Sent: Tuesday, July 30, 2013 2:25 AM
To: oxygen-user@oxygenxml.com
Subject: Re: [oXygen-user] Feature request: Validation for linked images in SVG paths

Hello Matt,

In Oxygen v15.0 we've added in the "Validate and check for Completeness" dialog a new entry called "Additional schematron checks" in which you can specify additional Schematron checks that should be be executed on the topics. You can perform the check you've described using a Schematron file with the following content:

<?xml version="1.0" encoding="UTF-8"?>
<schema
    xmlns="http://purl.oclc.org/dsdl/schematron"
    queryBinding="xslt2"
    xmlns:exslt="http://expath.org/ns/file">
    <ns uri="http://expath.org/ns/file" prefix="exslt"/>
    <pattern>
        <rule context="image[ends-with(@href, '.svg')]">
            <let name="svgDocument" value="document(@href)" />
            <assert test="exslt:exists(resolve-uri($svgDocument//*:image/@*:href, base-uri($svgDocument)))">
                The image file from the following SVG doesn't exist: <value-of select="base-uri($svgDocument)"/></assert>
        </rule>
    </pattern>
</schema>

Best regards,
Alex
--
Alex Jitianu
<oXygen/> XML Editor, Schema Editor and XSLT Editor/Debugger
http://www.oxygenxml.com

On 29-Jul-13 9:38 PM, KAATMAN Matthew wrote:
Hey Guys,

This is a feature request that's not extremely crucial, but it would be helpful for us.

I'm having our authors create SVG overlays and link to the background image (jpeg or png).

Sometimes they accidentally link to an image that isn't in our repository path.

Within the SVG, I'll end up with something like:

<image width="1200" height="1807" xlink:href="../../../../../../../Users/Username/Pictures/PREVI PAV/PAV_printer_cover_open.jpg" >

When it should be:

<image width="1200" height="1807" xlink:href="images/PAV_printer_cover_open.jpg" >

Although, the validate/check for completeness wouldn't catch this on their workstation as the image exists and is valid, it would find it quickly on mine since it's outside the path that gets checked in and I’d be missing that image.

It doesn't seem like the OT throws any errors either. The only way I find out is when I'm viewing the PDF and notice that antenna house has substituted a broken image.

Example:

Thanks!
Matt

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