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Chaining parse/write of rdf+xml leads to infinite expansion #182

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royludo opened this issue Apr 28, 2017 · 0 comments
Open

Chaining parse/write of rdf+xml leads to infinite expansion #182

royludo opened this issue Apr 28, 2017 · 0 comments

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@royludo
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royludo commented Apr 28, 2017

The library changes the output even when nothing has changed, which leads to unfortunate consequences.
Here is the (quite simple) input:

<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:myNS="http://www.example.org/">
  <rdf:Description rdf:about="#_000001">
    <myNS:hasProperty>
      <rdf:Bag></rdf:Bag>
    </myNS:hasProperty>
  </rdf:Description>
</rdf:RDF>

Parsing it and then writing it as application/rdf+xml (which should strictly produce the same result) produces this:

<rdf:RDF
 xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
 xmlns:myNS="http://www.example.org/">
    <rdf:Description rdf:about="/#_000001">
        <myNS:hasProperty rdf:parseType="Resource">
            <rdf:Description>
                <rdf:type rdf:resource="http://www.w3.org/1999/02/22-rdf-syntax-ns#Bag"/>
            </rdf:Description>
        </myNS:hasProperty>
    </rdf:Description>
</rdf:RDF>

Doing it again on this output leads to this:

<rdf:RDF
 xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
 xmlns:myNS="http://www.example.org/">
    <rdf:Description rdf:about="/#_000001">
        <myNS:hasProperty rdf:parseType="Resource">
            <rdf:Description>
                <rdf:Description rdf:parseType="Resource">
                    <rdf:Description>
                        <rdf:resource>http://www.w3.org/1999/02/22-rdf-syntax-ns#Bag</rdf:resource>
                        <rdf:type rdf:resource="http://www.w3.org/1999/02/22-rdf-syntax-ns#type"/>
                    </rdf:Description>
                </rdf:Description>
            </rdf:Description>
        </myNS:hasProperty>
    </rdf:Description>
</rdf:RDF>

And again:

<rdf:RDF
 xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
 xmlns:myNS="http://www.example.org/">
    <rdf:Description rdf:about="/#_000001">
        <myNS:hasProperty rdf:parseType="Resource">
            <rdf:Description>
                <rdf:Description rdf:parseType="Resource">
                    <rdf:Description>
                        <rdf:Description rdf:parseType="Resource">
                            <rdf:Description>
                                <rdf:type rdf:resource="http://www.w3.org/1999/02/22-rdf-syntax-ns#resource"/>
                                <rdf:value>http://www.w3.org/1999/02/22-rdf-syntax-ns#Bag</rdf:value>
                            </rdf:Description>
                        </rdf:Description>
                        <rdf:Description rdf:parseType="Resource">
                            <rdf:Description>
                                <rdf:resource>http://www.w3.org/1999/02/22-rdf-syntax-ns#type</rdf:resource>
                                <rdf:type rdf:resource="http://www.w3.org/1999/02/22-rdf-syntax-ns#type"/>
                            </rdf:Description>
                        </rdf:Description>
                        <rdf:parseType>Resource</rdf:parseType>
                    </rdf:Description>
                </rdf:Description>
            </rdf:Description>
        </myNS:hasProperty>
    </rdf:Description>
</rdf:RDF>

And so on...

<rdf:RDF
 xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
 xmlns:myNS="http://www.example.org/">
    <rdf:Description rdf:about="/#_000001">
        <myNS:hasProperty rdf:parseType="Resource">
            <rdf:Description>
                <rdf:Description rdf:parseType="Resource">
                    <rdf:Description>
                        <rdf:Description rdf:parseType="Resource">
                            <rdf:Description>
                                <rdf:Description rdf:parseType="Resource">
                                    <rdf:Description>
                                        <rdf:resource>http://www.w3.org/1999/02/22-rdf-syntax-ns#resource</rdf:resource>
                                        <rdf:type rdf:resource="http://www.w3.org/1999/02/22-rdf-syntax-ns#type"/>
                                    </rdf:Description>
                                </rdf:Description>
                                <rdf:Description rdf:parseType="Resource">
                                    <rdf:Description>
                                        <rdf:type rdf:resource="http://www.w3.org/1999/02/22-rdf-syntax-ns#value"/>
                                        <rdf:value>http://www.w3.org/1999/02/22-rdf-syntax-ns#Bag</rdf:value>
                                    </rdf:Description>
                                </rdf:Description>
                                <rdf:parseType>Resource</rdf:parseType>
                            </rdf:Description>
                        </rdf:Description>
                        <rdf:Description rdf:parseType="Resource">
                            <rdf:Description>
                                <rdf:Description rdf:parseType="Resource">
                                    <rdf:Description>
                                        <rdf:type rdf:resource="http://www.w3.org/1999/02/22-rdf-syntax-ns#resource"/>
                                        <rdf:value>http://www.w3.org/1999/02/22-rdf-syntax-ns#type</rdf:value>
                                    </rdf:Description>
                                </rdf:Description>
                                <rdf:Description rdf:parseType="Resource">
                                    <rdf:Description>
                                        <rdf:resource>http://www.w3.org/1999/02/22-rdf-syntax-ns#type</rdf:resource>
                                        <rdf:type rdf:resource="http://www.w3.org/1999/02/22-rdf-syntax-ns#type"/>
                                    </rdf:Description>
                                </rdf:Description>
                                <rdf:parseType>Resource</rdf:parseType>
                            </rdf:Description>
                        </rdf:Description>
                        <rdf:Description rdf:parseType="Resource">
                            <rdf:Description>
                                <rdf:type rdf:resource="http://www.w3.org/1999/02/22-rdf-syntax-ns#parseType"/>
                                <rdf:value>Resource</rdf:value>
                            </rdf:Description>
                        </rdf:Description>
                        <rdf:parseType>Resource</rdf:parseType>
                    </rdf:Description>
                </rdf:Description>
            </rdf:Description>
        </myNS:hasProperty>
    </rdf:Description>
</rdf:RDF>

That's a lot of lines, given that no information were added.
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@royludo