Schema does not validate media-type special characters

[telosBA]

Describe the bug

Schema does not validate media-type special characters e.g. “image/png” - doesn’t meet URI requirements.
{A clear and concise description of what the bug is.}

Who is the bug affecting?

Telos

What is affected by this bug?

Schema validation of XML files.
{Describe the impact the bug is having.}

When does this occur?

When validating XML files that contain media-type elements with special characters.
{Describe the conditions under which the bug is occurring.}

How do we replicate the issue?

Attempt to validate an XML file containing a media-type with a special character. e.g. “image/png”
{What are the steps to reproduce the behavior?

1. Do this...
2. Then this...
3. See error

If applicable, add screenshots to help explain your problem.}

Expected behavior (i.e. solution)

Error on associated line.
{A clear and concise description of what you expected to happen.}

Other Comments

{Add any other context about the problem here.}

[aj-stein-nist]

Can you please provide an example that evidences that such a @media-type does not pass validation? We checked and this data is of type string, so the / character should be acceptable and validate. Thanks!

[telosBA]

Here is the error output:

TCL-07068B:~ 13503$ xmllint --schema /Users/13503/PycharmProjects/OSCAL/oscal.xsd /Users/13503/PycharmProjects/OSCAL/NewXacta.xml --noout
/Users/13503/PycharmProjects/OSCAL/NewXacta.xml:459: element link: Schemas validity error : Element '{http://csrc.nist.gov/ns/oscal/1.0}link', attribute 'rel': [facet 'pattern'] The value 'image/png' is not accepted by the pattern '[\i-[:𐀀-�]][\c-[:𐀀-�]]*'.
/Users/13503/PycharmProjects/OSCAL/NewXacta.xml:459: element link: Schemas validity error : Element '{http://csrc.nist.gov/ns/oscal/1.0}link', attribute 'rel': 'image/png' is not a valid value of the atomic type '{http://csrc.nist.gov/ns/oscal/1.0}token'.
/Users/13503/PycharmProjects/OSCAL/NewXacta.xml fails to validate
TCL-07068B:~ 13503$

Would you also be able to clarify requirements/expectations for "rel" in this case?

[david-waltermire]

The media type does not get defined in the rel. The media-type field is the correct one for that information. Instead, the rel is used to define the relation type, which declares the nature of the linkage.

To clarify which rel value to use I would need to understand the purpose of the link.

[telosBA]

Noted, we misinterpreted the usage of rel This cleared up the issue.