2 elements with the same id attribute value

[dayures]

Originally reported by: Carlos Tejo (Bitbucket: carlos_tejo, GitHub: Unknown)

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As a feature, a human-readble "id" attribute is created for each artifact, using the URI fragment.
If more than one artifact has the same URI fragment (with different URI scheme, authority and path), the XHTML generated is not valid, because it is present more than one time the same "id" attribute value.

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• Bitbucket: https://bitbucket.org/fundacionctic/parrot/issue/4