To find the correct settings for the tagType and berConstruct attributes of a Tag Node (with type set to BERTag), first convert the tag value into binary. The top 2 bits of the binary result represent the tag type - the value to set for the attribute tagType:
tagType | Bit 1 | Bit 2 |
Universal | 0 | 0 |
Application | 0 | 1 |
Context | 1 | 0 |
Private | 1 | 1 |
The next (3rd) bit determines whether this tag represents a simple or constructed value, and therefore the value to set for the attribute berConstruct:
berConstruct | Bit 3 |
T | 1 |
F | 0 |
The remaining 5 bits represent the actual tag value. For example, if the given tag value is A5, in binary this is 10100101, and so:
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<Tag name="tagValue" type="BERTag" discriminator="59" tagType="Context" berConstruct="T"/> |
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