MIF Filter: expose content in the correct document order

Currently, the extractable content is exposed without its context. Anchored frames and tables appear as separate blocks earlier than any related paragraphs with references to them can be found. Besides that, the text lines content is missed.

Example 1:

Actual extraction order:

<trans-unit id="1" xml:space="preserve">
<source xml:lang="en">Table <x id="2"/>:</source>
<target xml:lang="fr">Table <x id="2"/>:</target>
</trans-unit>
<group id="1" restype="table">
<trans-unit id="2" xml:space="preserve">
<source xml:lang="en">on AFrame 1 > text frame 1.</source>
<target xml:lang="fr">on AFrame 1 > text frame 1.</target>
</trans-unit>
<group id="2" restype="row">
<group id="3" restype="cell">
<trans-unit id="3" xml:space="preserve">
<source xml:lang="en">h01</source>
<target xml:lang="fr">h01</target>
</trans-unit>
</group>
<group id="5" restype="cell">
<trans-unit id="4" xml:space="preserve">
<source xml:lang="en">h02</source>
<target xml:lang="fr">h02</target>
</trans-unit>
</group>
</group>
<group id="8" restype="row">
<group id="9" restype="cell">
<trans-unit id="5" xml:space="preserve">
<source xml:lang="en">c01</source>
<target xml:lang="fr">c01</target>
</trans-unit>
</group>
<group id="11" restype="cell">
<trans-unit id="6" xml:space="preserve">
<source xml:lang="en">c02</source>
<target xml:lang="fr">c02</target>
</trans-unit>
</group>
</group>
</group>
<group id="15" restype="table">
<trans-unit id="7" xml:space="preserve">
<source xml:lang="en">on AFrame 3 > text frame 1.</source>
<target xml:lang="fr">on AFrame 3 > text frame 1.</target>
</trans-unit>
<group id="16" restype="row">
<group id="17" restype="cell">
<trans-unit id="8" xml:space="preserve">
<source xml:lang="en">t01</source>
<target xml:lang="fr">t01</target>
</trans-unit>
</group>
<group id="19" restype="cell">
<trans-unit id="9" xml:space="preserve">
<source xml:lang="en">t02</source>
<target xml:lang="fr">t02</target>
</trans-unit>
</group>
</group>
</group>
<trans-unit id="10" xml:space="preserve">
<source xml:lang="en">Para on anchored frame 1 > text frame 1.</source>
<target xml:lang="fr">Para on anchored frame 1 > text frame 1.</target>
</trans-unit>
<trans-unit id="11" xml:space="preserve">
<source xml:lang="en">Para on anchored frame 1 > text frame 2.</source>
<target xml:lang="fr">Para on anchored frame 1 > text frame 2.</target>
</trans-unit>
<trans-unit id="12" xml:space="preserve">
<source xml:lang="en">Para on anchored frame 2 > text frame 1.</source>
<target xml:lang="fr">Para on anchored frame 2 > text frame 1.</target>
</trans-unit>
<trans-unit id="13" xml:space="preserve">
<source xml:lang="en">Para on anchored frame 3 > text frame 1.</source>
<target xml:lang="fr">Para on anchored frame 3 > text frame 1.</target>
</trans-unit>
<trans-unit id="14" xml:space="preserve">
<source xml:lang="en">Another para.</source>
<target xml:lang="fr">Another para.</target>
</trans-unit>
<trans-unit id="15" xml:space="preserve">
<source xml:lang="en">inside t02</source>
<target xml:lang="fr">inside t02</target>
</trans-unit>
<trans-unit id="16" xml:space="preserve">
<source xml:lang="en">Para 0.</source>
<target xml:lang="fr">Para 0.</target>
</trans-unit>

SDL editor output:

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Example 2:

SDL editor output:

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Example 3:

SDL editor output:

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Example 4:

SDL editor output:

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Example 5:

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SDL editor output:

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All related source documents can be found attached.