fixed metadata extension logic

[BezrukovM]

closes #916

[codecov]

Codecov Report

Merging #947 into integration will increase coverage by 0.1%.
The diff coverage is 75.38%.

@@               Coverage Diff                @@
##             integration     #947     +/-   ##
================================================
+ Coverage          27.37%   27.48%   +0.1%     
- Complexity           938      944      +6     
================================================
  Files                174      174             
  Lines               7155     7185     +30     
  Branches            1096     1104      +8     
================================================
+ Hits                1959     1975     +16     
- Misses              4938     4946      +8     
- Partials             258      264      +6

Impacted Files	Coverage Δ	Complexity Δ
...f/model/impl/axl/AXLExtensionSchemaDefinition.java	50% <ø> (ø)	34 <0> (ø)	⬇️
...g/verapdf/model/tools/xmp/ValidatorsContainer.java	54.21% <0%> (-2.75%)	18 <0> (ø)
...df/model/tools/xmp/ValidatorsContainerCreator.java	85.93% <100%> (+0.22%)	33 <3> (-5)	⬇️
...apdf/model/tools/xmp/SchemasDefinitionCreator.java	85.41% <66.66%> (-4.35%)	44 <4> (+3)
...f/model/impl/axl/AXLExtensionSchemasContainer.java	77.41% <76.92%> (-1.53%)	12 <0> (+2)
...java/org/verapdf/model/impl/axl/AXLXMPPackage.java	84.78% <95.23%> (+0.44%)	32 <7> (+6)	⬆️

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