[JIRA] Created: (MDA-49) add stage to remove empty Extensions element

[Ian Young (JIRA)]

add stage to remove empty Extensions element
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                 Key: MDA-49
                 URL: https://issues.shibboleth.net/jira/browse/MDA-49
             Project: Metadata Aggregator
          Issue Type: New Feature
          Components: SAML Metadata
    Affects Versions: 0.6
            Reporter: Ian Young
            Assignee: Ian Young
             Fix For: 0.7


The general Extensions element in SAML metadata has a requirement that it contain at least one child element.  This leaves any code which modifies an Extensions element by removing a child element with the possibility that a schema-invalid document may result.

One approach to this is to impose the burden of ensuring schema validity on every stage which performs any manipulation on SAML metadata, which might work in some cases but can be quite onerous.

Another approach is to provide a general stage which can fix up any Extensions elements which have become schema-invalid through whatever means.  This needs to be called only once, at the end of a series of potentially disturbing actions.

Assigning this to myself; I plan to prototype an implementation in the UKf context.

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