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Can I use LZO decompression in my grammar ?

When developing synalysis2kaitai I have encountered several anomalies in the grammars in this repo. Are these grammars valid? If they are, how should I treat them?

• Grammars/glb.grammar

  Line 20 in edcba05

  <binary name="chunk_type" id="15"/>

• Grammars/utf8.grammar

  Line 19 in edcba05

  <fixedvalues/>

• Grammars/bt.grammar

  Line 5 in edcba05

  <structure name="Marker" id="43" length="10" encoding="ISO_8859-1:1987" endian="big" signed="no" strokecolor="FEFFFF" fillcolor="000000"/>

• Grammars/bookmark.grammar

  Line 57 in edcba05

  <offset name="Bookmark Data" id="253" fillcolor="75D5FF" length="4" endian="little" references="id:252" relative-to="id:217" follownullreference="yes"/>

  - there is no id 217

I mean that there is enough information in the grammars themselves, but something is still unclear:

• the full list of available encodings ?
• what is dynamic endian?
• what is "pascal" string?
• what is the difference between zero-terminated and delimiter-terminated with delimiter=\0 ?
• what exactly do fixedvalues do?
• what does mustmatch do even 8n non-fixedvalues tags?
• can ids be non-integer?
  .... etc